21725944556 has 6 divisors (see below), whose sum is σ = 38020402980. Its totient is φ = 10862972276.

The previous prime is 21725944531. The next prime is 21725944579. The reversal of 21725944556 is 65544952712.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2715743066 + ... + 2715743073.

It is an arithmetic number, because the mean of its divisors is an integer number (6336733830).

Almost surely, 2^21725944556 is an apocalyptic number.

It is an amenable number.

21725944556 is a deficient number, since it is larger than the sum of its proper divisors (16294458424).

21725944556 is a wasteful number, since it uses less digits than its factorization.

21725944556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5431486143 (or 5431486141 counting only the distinct ones).

The product of its digits is 3024000, while the sum is 50.

The spelling of 21725944556 in words is "twenty-one billion, seven hundred twenty-five million, nine hundred forty-four thousand, five hundred fifty-six".