2221121310 has 64 divisors (see below), whose sum is σ = 5554483200. Its totient is φ = 567729792.

The previous prime is 2221121303. The next prime is 2221121317. The reversal of 2221121310 is 131211222.

2221121310 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (2221121303) and next prime (2221121317).

It is a super-2 number, since 2×2221121310² = 9866759747472232200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 2221121310.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2221121317) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 111747 + ... + 130113.

It is an arithmetic number, because the mean of its divisors is an integer number (86788800).

Almost surely, 2^2221121310 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2221121310, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2777241600).

2221121310 is an abundant number, since it is smaller than the sum of its proper divisors (3333361890).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2221121310 is a wasteful number, since it uses less digits than its factorization.

2221121310 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18545.

The product of its (nonzero) digits is 48, while the sum is 15.

The square root of 2221121310 is about 47128.7736950581. The cubic root of 2221121310 is about 1304.7403485117.

Adding to 2221121310 its reverse (131211222), we get a palindrome (2352332532).

The spelling of 2221121310 in words is "two billion, two hundred twenty-one million, one hundred twenty-one thousand, three hundred ten".