51021220031 has 8 divisors (see below), whose sum is σ = 52407981504. Its totient is φ = 49647008800.

The previous prime is 51021220027. The next prime is 51021220039. The reversal of 51021220031 is 13002212015.

It is a happy number.

51021220031 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 51021220031 - 2² = 51021220027 is a prime.

It is a super-2 number, since 2×51021220031² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51021219991 and 51021220009.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51021220039) 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, 3129320 + ... + 3145581.

It is an arithmetic number, because the mean of its divisors is an integer number (6550997688).

Almost surely, 2^51021220031 is an apocalyptic number.

51021220031 is a deficient number, since it is larger than the sum of its proper divisors (1386761473).

51021220031 is a wasteful number, since it uses less digits than its factorization.

51021220031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6275121.

The product of its (nonzero) digits is 120, while the sum is 17.

Adding to 51021220031 its reverse (13002212015), we get a palindrome (64023432046).

The spelling of 51021220031 in words is "fifty-one billion, twenty-one million, two hundred twenty thousand, thirty-one".