23551170065021 has 2 divisors, whose sum is σ = 23551170065022. Its totient is φ = 23551170065020.

The previous prime is 23551170064999. The next prime is 23551170065041. The reversal of 23551170065021 is 12056007115532.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20178019080025 + 3373150984996 = 4491995^2 + 1836614^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23551170065021 is a prime.

It is a super-2 number, since 2×23551170065021² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23551170065041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11775585032510 + 11775585032511.

It is an arithmetic number, because the mean of its divisors is an integer number (11775585032511).

Almost surely, 2^{23551170065021} is an apocalyptic number.

It is an amenable number.

23551170065021 is a deficient number, since it is larger than the sum of its proper divisors (1).

23551170065021 is an equidigital number, since it uses as much as digits as its factorization.

23551170065021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 63000, while the sum is 38.

The spelling of 23551170065021 in words is "twenty-three trillion, five hundred fifty-one billion, one hundred seventy million, sixty-five thousand, twenty-one".