21507526742631 has 8 divisors (see below), whose sum is σ = 29376134087664. Its totient is φ = 13988635279680.

The previous prime is 21507526742617. The next prime is 21507526742659. The reversal of 21507526742631 is 13624762570512.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21507526742631 - 2¹⁸ = 21507526480487 is a prime.

It is a super-2 number, since 2×21507526742631² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21507526746631) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 87428970376 + ... + 87428970621.

It is an arithmetic number, because the mean of its divisors is an integer number (3672016760958).

Almost surely, 2^{21507526742631} is an apocalyptic number.

21507526742631 is a deficient number, since it is larger than the sum of its proper divisors (7868607345033).

21507526742631 is a wasteful number, since it uses less digits than its factorization.

21507526742631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 174857941041.

The product of its (nonzero) digits is 4233600, while the sum is 51.

The spelling of 21507526742631 in words is "twenty-one trillion, five hundred seven billion, five hundred twenty-six million, seven hundred forty-two thousand, six hundred thirty-one".