21547960512 has 112 divisors (see below), whose sum is σ = 61444948992. Its totient is φ = 6625059840.

The previous prime is 21547960501. The next prime is 21547960549. The reversal of 21547960512 is 21506974512.

It is a super-2 number, since 2×21547960512² (a number of 21 digits) contains 22 as substring.

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 15 ways as a sum of consecutive naturals, for example, 4457937 + ... + 4462767.

It is an arithmetic number, because the mean of its divisors is an integer number (548615616).

Almost surely, 2^21547960512 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21547960512, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30722474496).

21547960512 is an abundant number, since it is smaller than the sum of its proper divisors (39896988480).

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

21547960512 is a wasteful number, since it uses less digits than its factorization.

21547960512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6646 (or 6636 counting only the distinct ones).

The product of its (nonzero) digits is 151200, while the sum is 42.

The spelling of 21547960512 in words is "twenty-one billion, five hundred forty-seven million, nine hundred sixty thousand, five hundred twelve".