51021039995 has 4 divisors (see below), whose sum is σ = 61225248000. Its totient is φ = 40816831992.

The previous prime is 51021039983. The next prime is 51021040013. The reversal of 51021039995 is 59993012015.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 59993012015 = 5 ⋅11998602403.

It is a cyclic number.

It is not a de Polignac number, because 51021039995 - 2²⁴ = 51004262779 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5102103995 + ... + 5102104004.

It is an arithmetic number, because the mean of its divisors is an integer number (15306312000).

Almost surely, 2^51021039995 is an apocalyptic number.

51021039995 is a deficient number, since it is larger than the sum of its proper divisors (10204208005).

51021039995 is a wasteful number, since it uses less digits than its factorization.

51021039995 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10204208004.

The product of its (nonzero) digits is 109350, while the sum is 44.

The spelling of 51021039995 in words is "fifty-one billion, twenty-one million, thirty-nine thousand, nine hundred ninety-five".