21745564174 has 16 divisors (see below), whose sum is σ = 33836886720. Its totient is φ = 10473315840.

The previous prime is 21745564171. The next prime is 21745564223. The reversal of 21745564174 is 47146554712.

It is a super-2 number, since 2×21745564174² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21745564171) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1671939 + ... + 1684894.

It is an arithmetic number, because the mean of its divisors is an integer number (2114805420).

Almost surely, 2^21745564174 is an apocalyptic number.

21745564174 is a deficient number, since it is larger than the sum of its proper divisors (12091322546).

21745564174 is a wasteful number, since it uses less digits than its factorization.

21745564174 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3356955.

The product of its digits is 940800, while the sum is 46.

The spelling of 21745564174 in words is "twenty-one billion, seven hundred forty-five million, five hundred sixty-four thousand, one hundred seventy-four".