21002051432 has 32 divisors (see below), whose sum is σ = 41584795200. Its totient is φ = 9916329600.

The previous prime is 21002051423. The next prime is 21002051449. The reversal of 21002051432 is 23415020012.

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, 174869 + ... + 269412.

It is an arithmetic number, because the mean of its divisors is an integer number (1299524850).

Almost surely, 2^21002051432 is an apocalyptic number.

It is an amenable number.

21002051432 is a deficient number, since it is larger than the sum of its proper divisors (20582743768).

21002051432 is a wasteful number, since it uses less digits than its factorization.

21002051432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 444617 (or 444613 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 20.

Adding to 21002051432 its reverse (23415020012), we get a palindrome (44417071444).

The spelling of 21002051432 in words is "twenty-one billion, two million, fifty-one thousand, four hundred thirty-two".