21854764004 has 12 divisors (see below), whose sum is σ = 38248448700. Its totient is φ = 10926635808.

The previous prime is 21854763991. The next prime is 21854764021. The reversal of 21854764004 is 40046745812.

It can be written as a sum of positive squares in 2 ways, for example, as 17861787904 + 3992976100 = 133648^2 + 63190^2 .

It is a super-2 number, since 2×21854764004² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 117839 + ... + 239990.

It is an arithmetic number, because the mean of its divisors is an integer number (3187370725).

Almost surely, 2^21854764004 is an apocalyptic number.

It is an amenable number.

21854764004 is a deficient number, since it is larger than the sum of its proper divisors (16393684696).

21854764004 is a wasteful number, since it uses less digits than its factorization.

21854764004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 373102 (or 373100 counting only the distinct ones).

The product of its (nonzero) digits is 215040, while the sum is 41.

The spelling of 21854764004 in words is "twenty-one billion, eight hundred fifty-four million, seven hundred sixty-four thousand, four".