21704375457 has 12 divisors (see below), whose sum is σ = 31380271104. Its totient is φ = 14455965240.

The previous prime is 21704375453. The next prime is 21704375467. The reversal of 21704375457 is 75457340712.

21704375457 is a `hidden beast` number, since 2 + 1 + 70 + 4 + 37 + 545 + 7 = 666.

It is not a de Polignac number, because 21704375457 - 2² = 21704375453 is a prime.

It is a hoax number, since the sum of its digits (45) 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 (21704375453) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1124769 + ... + 1143902.

It is an arithmetic number, because the mean of its divisors is an integer number (2615022592).

Almost surely, 2^21704375457 is an apocalyptic number.

It is an amenable number.

21704375457 is a deficient number, since it is larger than the sum of its proper divisors (9675895647).

21704375457 is a wasteful number, since it uses less digits than its factorization.

21704375457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2269740 (or 2269737 counting only the distinct ones).

The product of its (nonzero) digits is 823200, while the sum is 45.

The spelling of 21704375457 in words is "twenty-one billion, seven hundred four million, three hundred seventy-five thousand, four hundred fifty-seven".