51134153668021 has 4 divisors (see below), whose sum is σ = 51173457400044. Its totient is φ = 51094849936000.

The previous prime is 51134153667997. The next prime is 51134153668099. The reversal of 51134153668021 is 12086635143115.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 174343827025 + 50959809840996 = 417545^2 + 7138614^2 .

It is a cyclic number.

It is not a de Polignac number, because 51134153668021 - 2³³ = 51125563733429 is a prime.

It is a super-2 number, since 2×51134153668021² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51134153668321) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19651864060 + ... + 19651866661.

It is an arithmetic number, because the mean of its divisors is an integer number (12793364350011).

Almost surely, 2^{51134153668021} is an apocalyptic number.

It is an amenable number.

51134153668021 is a deficient number, since it is larger than the sum of its proper divisors (39303732023).

51134153668021 is a wasteful number, since it uses less digits than its factorization.

51134153668021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39303732022.

The product of its (nonzero) digits is 518400, while the sum is 46.

The spelling of 51134153668021 in words is "fifty-one trillion, one hundred thirty-four billion, one hundred fifty-three million, six hundred sixty-eight thousand, twenty-one".