21024431024 has 20 divisors (see below), whose sum is σ = 40737083880. Its totient is φ = 10511635200.

The previous prime is 21024431017. The next prime is 21024431033. The reversal of 21024431024 is 42013442012.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 542072 + ... + 579560.

It is an arithmetic number, because the mean of its divisors is an integer number (2036854194).

Almost surely, 2^21024431024 is an apocalyptic number.

It is an amenable number.

21024431024 is a deficient number, since it is larger than the sum of its proper divisors (19712652856).

21024431024 is a wasteful number, since it uses less digits than its factorization.

21024431024 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72548 (or 72542 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 23.

Adding to 21024431024 its reverse (42013442012), we get a palindrome (63037873036).

The spelling of 21024431024 in words is "twenty-one billion, twenty-four million, four hundred thirty-one thousand, twenty-four".