51241222521 has 6 divisors (see below), whose sum is σ = 74015099210. Its totient is φ = 34160815008.

The previous prime is 51241222499. The next prime is 51241222567. The reversal of 51241222521 is 12522214215.

51241222521 is a `hidden beast` number, since 5 + 1 + 2 + 412 + 225 + 21 = 666.

It can be written as a sum of positive squares in only one way, i.e., 50929205625 + 312016896 = 225675^2 + 17664^2 .

It is not a de Polignac number, because 51241222521 - 2⁶ = 51241222457 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51241222121) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2846734576 + ... + 2846734593.

Almost surely, 2^51241222521 is an apocalyptic number.

It is an amenable number.

51241222521 is a deficient number, since it is larger than the sum of its proper divisors (22773876689).

51241222521 is a wasteful number, since it uses less digits than its factorization.

51241222521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5693469175 (or 5693469172 counting only the distinct ones).

The product of its digits is 3200, while the sum is 27.

Adding to 51241222521 its reverse (12522214215), we get a palindrome (63763436736).

The spelling of 51241222521 in words is "fifty-one billion, two hundred forty-one million, two hundred twenty-two thousand, five hundred twenty-one".