2221121320 has 32 divisors (see below), whose sum is σ = 5451844320. Its totient is φ = 807680320.

The previous prime is 2221121317. The next prime is 2221121323. The reversal of 2221121320 is 231211222.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (2221121317) and next prime (2221121323).

It is a junction number, because it is equal to n+sod(n) for n = 2221121294 and 2221121303.

It is not an unprimeable number, because it can be changed into a prime (2221121323) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2523562 + ... + 2524441.

It is an arithmetic number, because the mean of its divisors is an integer number (170370135).

Almost surely, 2^2221121320 is an apocalyptic number.

2221121320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2221121320 is an abundant number, since it is smaller than the sum of its proper divisors (3230723000).

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

2221121320 is a wasteful number, since it uses less digits than its factorization.

2221121320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5048025 (or 5048021 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 2221121320 is about 47128.7738011504. The cubic root of 2221121320 is about 1304.7403504698.

Adding to 2221121320 its reverse (231211222), we get a palindrome (2452332542).

The spelling of 2221121320 in words is "two billion, two hundred twenty-one million, one hundred twenty-one thousand, three hundred twenty".