51416025021 has 10 divisors (see below), whose sum is σ = 76806654782. Its totient is φ = 34277349960.

The previous prime is 51416025019. The next prime is 51416025121. The reversal of 51416025021 is 12052061415.

51416025021 is a `hidden beast` number, since 5 + 1 + 4 + 1 + 602 + 50 + 2 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 36370304100 + 15045720921 = 190710^2 + 122661^2 .

It is not a de Polignac number, because 51416025021 - 2¹ = 51416025019 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51416025121) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 317382790 + ... + 317382951.

Almost surely, 2^51416025021 is an apocalyptic number.

It is an amenable number.

51416025021 is a deficient number, since it is larger than the sum of its proper divisors (25390629761).

51416025021 is an equidigital number, since it uses as much as digits as its factorization.

51416025021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 634765753 (or 634765744 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 27.

Adding to 51416025021 its reverse (12052061415), we get a palindrome (63468086436).

The spelling of 51416025021 in words is "fifty-one billion, four hundred sixteen million, twenty-five thousand, twenty-one".