51022021020 has 48 divisors (see below), whose sum is σ = 149073039360. Its totient is φ = 13014312256.

The previous prime is 51022021009. The next prime is 51022021027. The reversal of 51022021020 is 2012022015.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51022021027) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18484860 + ... + 18487619.

It is an arithmetic number, because the mean of its divisors is an integer number (3105688320).

Almost surely, 2^51022021020 is an apocalyptic number.

It is an amenable number.

51022021020 is an abundant number, since it is smaller than the sum of its proper divisors (98051018340).

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

51022021020 is a wasteful number, since it uses less digits than its factorization.

51022021020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36972514 (or 36972512 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 15.

Adding to 51022021020 its reverse (2012022015), we get a palindrome (53034043035).

The spelling of 51022021020 in words is "fifty-one billion, twenty-two million, twenty-one thousand, twenty".