21544325075161 has 32 divisors (see below), whose sum is σ = 25537734311936. Its totient is φ = 17785564632000.

The previous prime is 21544325075153. The next prime is 21544325075201. The reversal of 21544325075161 is 16157052344512.

It is a cyclic number.

It is not a de Polignac number, because 21544325075161 - 2³ = 21544325075153 is a prime.

It is a super-2 number, since 2×21544325075161² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21544325075101) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 171289666 + ... + 171415396.

It is an arithmetic number, because the mean of its divisors is an integer number (798054197248).

Almost surely, 2^{21544325075161} is an apocalyptic number.

It is an amenable number.

21544325075161 is a deficient number, since it is larger than the sum of its proper divisors (3993409236775).

21544325075161 is a wasteful number, since it uses less digits than its factorization.

21544325075161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129533.

The product of its (nonzero) digits is 1008000, while the sum is 46.

The spelling of 21544325075161 in words is "twenty-one trillion, five hundred forty-four billion, three hundred twenty-five million, seventy-five thousand, one hundred sixty-one".