21545541504131 has 8 divisors (see below), whose sum is σ = 22302843151680. Its totient is φ = 20789196652672.

The previous prime is 21545541504083. The next prime is 21545541504161. The reversal of 21545541504131 is 13140514554512.

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

It is a cyclic number.

It is not a de Polignac number, because 21545541504131 - 2²² = 21545537309827 is a prime.

It is a super-2 number, since 2×21545541504131² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21545541504161) 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, 239153195 + ... + 239243268.

It is an arithmetic number, because the mean of its divisors is an integer number (2787855393960).

Almost surely, 2^{21545541504131} is an apocalyptic number.

21545541504131 is a deficient number, since it is larger than the sum of its proper divisors (757301647549).

21545541504131 is a wasteful number, since it uses less digits than its factorization.

21545541504131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 478398045.

The product of its (nonzero) digits is 240000, while the sum is 41.

The spelling of 21545541504131 in words is "twenty-one trillion, five hundred forty-five billion, five hundred forty-one million, five hundred four thousand, one hundred thirty-one".