21132021544 has 16 divisors (see below), whose sum is σ = 39624372000. Its totient is φ = 10565522352.

The previous prime is 21132021539. The next prime is 21132021593. The reversal of 21132021544 is 44512023112.

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, 177789 + ... + 271795.

It is an arithmetic number, because the mean of its divisors is an integer number (2476523250).

Almost surely, 2^21132021544 is an apocalyptic number.

It is an amenable number.

21132021544 is a deficient number, since it is larger than the sum of its proper divisors (18492350456).

21132021544 is a wasteful number, since it uses less digits than its factorization.

21132021544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122112 (or 122108 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 25.

Adding to 21132021544 its reverse (44512023112), we get a palindrome (65644044656).

The spelling of 21132021544 in words is "twenty-one billion, one hundred thirty-two million, twenty-one thousand, five hundred forty-four".