51021104020 has 24 divisors (see below), whose sum is σ = 109165911624. Its totient is φ = 20023376256.

The previous prime is 51021104003. The next prime is 51021104023. The reversal of 51021104020 is 2040112015.

It can be written as a sum of positive squares in 4 ways, for example, as 11822647824 + 39198456196 = 108732^2 + 197986^2 .

It is a junction number, because it is equal to n+sod(n) for n = 51021103985 and 51021104003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51021104023) 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, 24065499 + ... + 24067618.

It is an arithmetic number, because the mean of its divisors is an integer number (4548579651).

Almost surely, 2^51021104020 is an apocalyptic number.

It is an amenable number.

51021104020 is an abundant number, since it is smaller than the sum of its proper divisors (58144807604).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51021104020 is a wasteful number, since it uses less digits than its factorization.

51021104020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48133179 (or 48133177 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 16.

Adding to 51021104020 its reverse (2040112015), we get a palindrome (53061216035).

The spelling of 51021104020 in words is "fifty-one billion, twenty-one million, one hundred four thousand, twenty".