51262427721 has 8 divisors (see below), whose sum is σ = 68359233600. Its totient is φ = 34170286832.

The previous prime is 51262427659. The next prime is 51262427753. The reversal of 51262427721 is 12772426215.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 51262427721 - 2²⁹ = 50725556809 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 51262427721.

It is not an unprimeable number, because it can be changed into a prime (51262427221) 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, 1140525 + ... + 1184618.

It is an arithmetic number, because the mean of its divisors is an integer number (8544904200).

Almost surely, 2^51262427721 is an apocalyptic number.

It is an amenable number.

51262427721 is a deficient number, since it is larger than the sum of its proper divisors (17096805879).

51262427721 is a wasteful number, since it uses less digits than its factorization.

51262427721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2332495.

The product of its digits is 94080, while the sum is 39.

The spelling of 51262427721 in words is "fifty-one billion, two hundred sixty-two million, four hundred twenty-seven thousand, seven hundred twenty-one".