21056013060 has 24 divisors (see below), whose sum is σ = 58956836736. Its totient is φ = 5614936800.

The previous prime is 21056013029. The next prime is 21056013101. The reversal of 21056013060 is 6031065012.

It is a self number, because there is not a number n which added to its sum of digits gives 21056013060.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 175466716 + ... + 175466835.

It is an arithmetic number, because the mean of its divisors is an integer number (2456534864).

Almost surely, 2^21056013060 is an apocalyptic number.

21056013060 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21056013060 is an abundant number, since it is smaller than the sum of its proper divisors (37900823676).

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

21056013060 is a wasteful number, since it uses less digits than its factorization.

21056013060 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 350933563 (or 350933561 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 24.

Adding to 21056013060 its reverse (6031065012), we get a palindrome (27087078072).

The spelling of 21056013060 in words is "twenty-one billion, fifty-six million, thirteen thousand, sixty".