21917000002604 has 48 divisors (see below), whose sum is σ = 45867835754496. Its totient is φ = 8965479427200.

The previous prime is 21917000002589. The next prime is 21917000002631. The reversal of 21917000002604 is 40620000071912.

It is a happy number.

It is a super-2 number, since 2×21917000002604² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 172881842 + ... + 173008569.

It is an arithmetic number, because the mean of its divisors is an integer number (955579911552).

Almost surely, 2^{21917000002604} is an apocalyptic number.

It is an amenable number.

21917000002604 is an abundant number, since it is smaller than the sum of its proper divisors (23950835751892).

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

21917000002604 is a wasteful number, since it uses less digits than its factorization.

21917000002604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 345890526 (or 345890524 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 32.

The spelling of 21917000002604 in words is "twenty-one trillion, nine hundred seventeen billion, two thousand, six hundred four".