51060651021 has 16 divisors (see below), whose sum is σ = 75652243200. Its totient is φ = 34037358624.

The previous prime is 51060651013. The next prime is 51060651049. The reversal of 51060651021 is 12015606015.

It is a happy number.

51060651021 is a `hidden beast` number, since 5 + 1 + 0 + 6 + 0 + 651 + 0 + 2 + 1 = 666.

It is not a de Polignac number, because 51060651021 - 2³ = 51060651013 is a prime.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51060651221) 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, 241740 + ... + 400698.

It is an arithmetic number, because the mean of its divisors is an integer number (4728265200).

Almost surely, 2^51060651021 is an apocalyptic number.

It is an amenable number.

51060651021 is a deficient number, since it is larger than the sum of its proper divisors (24591592179).

51060651021 is a wasteful number, since it uses less digits than its factorization.

51060651021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 170865 (or 170859 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 27.

The spelling of 51060651021 in words is "fifty-one billion, sixty million, six hundred fifty-one thousand, twenty-one".