21551432155241 has 16 divisors (see below), whose sum is σ = 22024096548864. Its totient is φ = 21083645810304.

The previous prime is 21551432155189. The next prime is 21551432155343. The reversal of 21551432155241 is 14255123415512.

It is a cyclic number.

It is not a de Polignac number, because 21551432155241 - 2¹⁸ = 21551431893097 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21551432155741) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 37662230 + ... + 38230176.

It is an arithmetic number, because the mean of its divisors is an integer number (1376506034304).

Almost surely, 2^{21551432155241} is an apocalyptic number.

It is an amenable number.

21551432155241 is a deficient number, since it is larger than the sum of its proper divisors (472664393623).

21551432155241 is a wasteful number, since it uses less digits than its factorization.

21551432155241 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 572240.

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

The spelling of 21551432155241 in words is "twenty-one trillion, five hundred fifty-one billion, four hundred thirty-two million, one hundred fifty-five thousand, two hundred forty-one".