21161355224 has 32 divisors (see below), whose sum is σ = 40198464000. Its totient is φ = 10441889952.

The previous prime is 21161355181. The next prime is 21161355233. The reversal of 21161355224 is 42255316112.

It is a congruent number.

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, 1623437 + ... + 1636419.

It is an arithmetic number, because the mean of its divisors is an integer number (1256202000).

Almost surely, 2^21161355224 is an apocalyptic number.

It is an amenable number.

21161355224 is a deficient number, since it is larger than the sum of its proper divisors (19037108776).

21161355224 is a wasteful number, since it uses less digits than its factorization.

21161355224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15647 (or 15643 counting only the distinct ones).

The product of its digits is 14400, while the sum is 32.

The spelling of 21161355224 in words is "twenty-one billion, one hundred sixty-one million, three hundred fifty-five thousand, two hundred twenty-four".