21725847364 has 12 divisors (see below), whose sum is σ = 40944866284. Its totient is φ = 10027314144.

The previous prime is 21725847361. The next prime is 21725847373. The reversal of 21725847364 is 46374852712.

It can be written as a sum of positive squares in 2 ways, for example, as 6616520964 + 15109326400 = 81342^2 + 122920^2 .

It is a hoax number, since the sum of its digits (49) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (21725847361) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 208902327 + ... + 208902430.

Almost surely, 2^21725847364 is an apocalyptic number.

It is an amenable number.

21725847364 is a deficient number, since it is larger than the sum of its proper divisors (19219018920).

21725847364 is a wasteful number, since it uses less digits than its factorization.

21725847364 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 417804774 (or 417804772 counting only the distinct ones).

The product of its digits is 2257920, while the sum is 49.

The spelling of 21725847364 in words is "twenty-one billion, seven hundred twenty-five million, eight hundred forty-seven thousand, three hundred sixty-four".