21040520232 has 64 divisors (see below), whose sum is σ = 54327905280. Its totient is φ = 6786343872.

The previous prime is 21040520227. The next prime is 21040520243. The reversal of 21040520232 is 23202504012.

It is a junction number, because it is equal to n+sod(n) for n = 21040520199 and 21040520208.

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, 15153 + ... + 205695.

It is an arithmetic number, because the mean of its divisors is an integer number (848873520).

Almost surely, 2^21040520232 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 21040520232, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27163952640).

21040520232 is an abundant number, since it is smaller than the sum of its proper divisors (33287385048).

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

21040520232 is a wasteful number, since it uses less digits than its factorization.

21040520232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 190702 (or 190698 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 21.

The spelling of 21040520232 in words is "twenty-one billion, forty million, five hundred twenty thousand, two hundred thirty-two".