21573454109607 has 12 divisors (see below), whose sum is σ = 31163284190584. Its totient is φ = 14381551237680.

The previous prime is 21573454109579. The next prime is 21573454109609. The reversal of 21573454109607 is 70690145437512.

21573454109607 is a `hidden beast` number, since 2 + 1 + 5 + 7 + 3 + 4 + 541 + 0 + 96 + 0 + 7 = 666.

It is a de Polignac number, because none of the positive numbers 2^k-21573454109607 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21573454109609) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 62443333 + ... + 62787870.

Almost surely, 2^{21573454109607} is an apocalyptic number.

21573454109607 is a deficient number, since it is larger than the sum of its proper divisors (9589830080977).

21573454109607 is a wasteful number, since it uses less digits than its factorization.

21573454109607 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125250350 (or 125250347 counting only the distinct ones).

The product of its (nonzero) digits is 6350400, while the sum is 54.

The spelling of 21573454109607 in words is "twenty-one trillion, five hundred seventy-three billion, four hundred fifty-four million, one hundred nine thousand, six hundred seven".