21772285738 has 48 divisors (see below), whose sum is σ = 39620738304. Its totient is φ = 8936766720.

The previous prime is 21772285709. The next prime is 21772285741. The reversal of 21772285738 is 83758227712.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 257745 + ... + 331627.

It is an arithmetic number, because the mean of its divisors is an integer number (825432048).

Almost surely, 2^21772285738 is an apocalyptic number.

21772285738 is a deficient number, since it is larger than the sum of its proper divisors (17848452566).

21772285738 is a wasteful number, since it uses less digits than its factorization.

21772285738 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74027 (or 74020 counting only the distinct ones).

The product of its digits is 2634240, while the sum is 52.

The spelling of 21772285738 in words is "twenty-one billion, seven hundred seventy-two million, two hundred eighty-five thousand, seven hundred thirty-eight".