21626717004 has 36 divisors (see below), whose sum is σ = 54691400400. Its totient is φ = 7205758560.

The previous prime is 21626716913. The next prime is 21626717009. The reversal of 21626717004 is 40071762612.

21626717004 is a `hidden beast` number, since 21 + 626 + 7 + 1 + 7 + 0 + 0 + 4 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×21626717004² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 21626717004.

It is not an unprimeable number, because it can be changed into a prime (21626717009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 46779 + ... + 213170.

Almost surely, 2^21626717004 is an apocalyptic number.

It is an amenable number.

21626717004 is an abundant number, since it is smaller than the sum of its proper divisors (33064683396).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21626717004 is a wasteful number, since it uses less digits than its factorization.

21626717004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 262270 (or 262265 counting only the distinct ones).

The product of its (nonzero) digits is 28224, while the sum is 36.

The spelling of 21626717004 in words is "twenty-one billion, six hundred twenty-six million, seven hundred seventeen thousand, four".