21517745044700 has 18 divisors (see below), whose sum is σ = 46693506747216. Its totient is φ = 8607098017840.

The previous prime is 21517745044669. The next prime is 21517745044723. The reversal of 21517745044700 is 744054771512.

It is a super-2 number, since 2×21517745044700² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 107588725124 + ... + 107588725323.

Almost surely, 2^{21517745044700} is an apocalyptic number.

21517745044700 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21517745044700 is an abundant number, since it is smaller than the sum of its proper divisors (25175761702516).

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

21517745044700 is a wasteful number, since it uses less digits than its factorization.

21517745044700 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 215177450461 (or 215177450454 counting only the distinct ones).

The product of its (nonzero) digits is 1097600, while the sum is 47.

The spelling of 21517745044700 in words is "twenty-one trillion, five hundred seventeen billion, seven hundred forty-five million, forty-four thousand, seven hundred".