51113434221 has 36 divisors (see below), whose sum is σ = 77627483388. Its totient is φ = 32405146752.

The previous prime is 51113434181. The next prime is 51113434241. The reversal of 51113434221 is 12243431115.

51113434221 is a `hidden beast` number, since 5 + 1 + 1 + 1 + 3 + 434 + 221 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 34553604996 + 16559829225 = 185886^2 + 128685^2 .

It is not a de Polignac number, because 51113434221 - 2¹⁹ = 51112909933 is a prime.

It is a super-2 number, since 2×51113434221² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51113434241) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 792625 + ... + 854681.

It is an arithmetic number, because the mean of its divisors is an integer number (2156318983).

Almost surely, 2^51113434221 is an apocalyptic number.

It is an amenable number.

51113434221 is a deficient number, since it is larger than the sum of its proper divisors (26514049167).

51113434221 is a wasteful number, since it uses less digits than its factorization.

51113434221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62282 (or 62256 counting only the distinct ones).

The product of its digits is 2880, while the sum is 27.

Adding to 51113434221 its reverse (12243431115), we get a palindrome (63356865336).

The spelling of 51113434221 in words is "fifty-one billion, one hundred thirteen million, four hundred thirty-four thousand, two hundred twenty-one".