51465236326221 has 4 divisors (see below), whose sum is σ = 68620315101632. Its totient is φ = 34310157550812.

The previous prime is 51465236326187. The next prime is 51465236326241. The reversal of 51465236326221 is 12262363256415.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 51465236326221 - 2²⁷ = 51465102108493 is a prime.

It is a super-2 number, since 2×51465236326221² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51465236326241) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8577539387701 + ... + 8577539387706.

It is an arithmetic number, because the mean of its divisors is an integer number (17155078775408).

Almost surely, 2^{51465236326221} is an apocalyptic number.

It is an amenable number.

51465236326221 is a deficient number, since it is larger than the sum of its proper divisors (17155078775411).

51465236326221 is a wasteful number, since it uses less digits than its factorization.

51465236326221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17155078775410.

The product of its digits is 3110400, while the sum is 48.

The spelling of 51465236326221 in words is "fifty-one trillion, four hundred sixty-five billion, two hundred thirty-six million, three hundred twenty-six thousand, two hundred twenty-one".