21652432502456 has 128 divisors (see below), whose sum is σ = 47677027507200. Its totient is φ = 9025252346880.

The previous prime is 21652432502429. The next prime is 21652432502471. The reversal of 21652432502456 is 65420523425612.

It is a self number, because there is not a number n which added to its sum of digits gives 21652432502456.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1847628965 + ... + 1847640683.

It is an arithmetic number, because the mean of its divisors is an integer number (372476777400).

Almost surely, 2^{21652432502456} 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 21652432502456, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23838513753600).

21652432502456 is an abundant number, since it is smaller than the sum of its proper divisors (26024595004744).

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

21652432502456 is a wasteful number, since it uses less digits than its factorization.

21652432502456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14197 (or 14193 counting only the distinct ones).

The product of its (nonzero) digits is 3456000, while the sum is 47.

The spelling of 21652432502456 in words is "twenty-one trillion, six hundred fifty-two billion, four hundred thirty-two million, five hundred two thousand, four hundred fifty-six".