21624005045256 has 32 divisors (see below), whose sum is σ = 54061404557760. Its totient is φ = 7207816089152.

The previous prime is 21624005045239. The next prime is 21624005045347. The reversal of 21624005045256 is 65254050042612.

It is a happy number.

It is a super-3 number, since 3×21624005045256³ (a number of 41 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10646415 + ... + 12513758.

It is an arithmetic number, because the mean of its divisors is an integer number (1689418892430).

Almost surely, 2^{21624005045256} is an apocalyptic number.

It is an amenable number.

21624005045256 is an abundant number, since it is smaller than the sum of its proper divisors (32437399512504).

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

21624005045256 is a wasteful number, since it uses less digits than its factorization.

21624005045256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23199085 (or 23199081 counting only the distinct ones).

The product of its (nonzero) digits is 576000, while the sum is 42.

Adding to 21624005045256 its reverse (65254050042612), we get a palindrome (86878055087868).

The spelling of 21624005045256 in words is "twenty-one trillion, six hundred twenty-four billion, five million, forty-five thousand, two hundred fifty-six".