51971177421 has 8 divisors (see below), whose sum is σ = 76994336960. Its totient is φ = 34647451596.

The previous prime is 51971177393. The next prime is 51971177431. The reversal of 51971177421 is 12477117915.

51971177421 is a `hidden beast` number, since 51 + 9 + 7 + 1 + 177 + 421 = 666.

It is not a de Polignac number, because 51971177421 - 2⁵ = 51971177389 is a prime.

It is a super-2 number, since 2×51971177421² (a number of 22 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 (51971177431) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 962429185 + ... + 962429238.

It is an arithmetic number, because the mean of its divisors is an integer number (9624292120).

Almost surely, 2^51971177421 is an apocalyptic number.

It is an amenable number.

51971177421 is a deficient number, since it is larger than the sum of its proper divisors (25023159539).

51971177421 is a wasteful number, since it uses less digits than its factorization.

51971177421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1924858432 (or 1924858426 counting only the distinct ones).

The product of its digits is 123480, while the sum is 45.

The spelling of 51971177421 in words is "fifty-one billion, nine hundred seventy-one million, one hundred seventy-seven thousand, four hundred twenty-one".