21523135014536 has 8 divisors (see below), whose sum is σ = 40355878152270. Its totient is φ = 10761567507264.

The previous prime is 21523135014533. The next prime is 21523135014541. The reversal of 21523135014536 is 63541053132512.

It can be written as a sum of positive squares in only one way, i.e., 17804770984900 + 3718364029636 = 4219570^2 + 1928306^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 21523135014493 and 21523135014502.

It is not an unprimeable number, because it can be changed into a prime (21523135014533) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1345195938401 + ... + 1345195938416.

Almost surely, 2^{21523135014536} is an apocalyptic number.

It is an amenable number.

21523135014536 is a deficient number, since it is larger than the sum of its proper divisors (18832743137734).

21523135014536 is a wasteful number, since it uses less digits than its factorization.

21523135014536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2690391876823 (or 2690391876819 counting only the distinct ones).

The product of its (nonzero) digits is 324000, while the sum is 41.

The spelling of 21523135014536 in words is "twenty-one trillion, five hundred twenty-three billion, one hundred thirty-five million, fourteen thousand, five hundred thirty-six".