2221421520 has 80 divisors (see below), whose sum is σ = 6898933440. Its totient is φ = 591301632.

The previous prime is 2221421491. The next prime is 2221421557. The reversal of 2221421520 is 251241222.

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-2 number, since 2×2221421520² = 9869427139038220800, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 128427 + ... + 144693.

It is an arithmetic number, because the mean of its divisors is an integer number (86236668).

Almost surely, 2^2221421520 is an apocalyptic number.

2221421520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2221421520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3449466720).

2221421520 is an abundant number, since it is smaller than the sum of its proper divisors (4677511920).

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

2221421520 is a wasteful number, since it uses less digits than its factorization.

2221421520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16852 (or 16846 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 21.

The square root of 2221421520 is about 47131.9585843831. The cubic root of 2221421520 is about 1304.7991294005.

Adding to 2221421520 its reverse (251241222), we get a palindrome (2472662742).

It can be divided in two parts, 22214 and 21520, that added together give a palindrome (43734).

The spelling of 2221421520 in words is "two billion, two hundred twenty-one million, four hundred twenty-one thousand, five hundred twenty".