21020650432 has 14 divisors (see below), whose sum is σ = 41712853328. Its totient is φ = 10510325184.

The previous prime is 21020650423. The next prime is 21020650451. The reversal of 21020650432 is 23405602012.

It is a junction number, because it is equal to n+sod(n) for n = 21020650397 and 21020650406.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 164223768 + ... + 164223895.

Almost surely, 2^21020650432 is an apocalyptic number.

It is an amenable number.

21020650432 is a deficient number, since it is larger than the sum of its proper divisors (20692202896).

21020650432 is an equidigital number, since it uses as much as digits as its factorization.

21020650432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 328447675 (or 328447665 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 25.

The spelling of 21020650432 in words is "twenty-one billion, twenty million, six hundred fifty thousand, four hundred thirty-two".