21531513141 has 6 divisors (see below), whose sum is σ = 31101074550. Its totient is φ = 14354342088.

The previous prime is 21531513139. The next prime is 21531513161. The reversal of 21531513141 is 14131513512.

21531513141 is a `hidden beast` number, since 2 + 1 + 5 + 3 + 1 + 513 + 141 = 666.

It can be written as a sum of positive squares in only one way, i.e., 16299884241 + 5231628900 = 127671^2 + 72330^2 .

It is not a de Polignac number, because 21531513141 - 2¹ = 21531513139 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21531513161) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1196195166 + ... + 1196195183.

It is an arithmetic number, because the mean of its divisors is an integer number (5183512425).

Almost surely, 2^21531513141 is an apocalyptic number.

It is an amenable number.

21531513141 is a deficient number, since it is larger than the sum of its proper divisors (9569561409).

21531513141 is a wasteful number, since it uses less digits than its factorization.

21531513141 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2392390355 (or 2392390352 counting only the distinct ones).

The product of its digits is 1800, while the sum is 27.

The spelling of 21531513141 in words is "twenty-one billion, five hundred thirty-one million, five hundred thirteen thousand, one hundred forty-one".