51701760021 has 4 divisors (see below), whose sum is σ = 68935680032. Its totient is φ = 34467840012.

The previous prime is 51701759999. The next prime is 51701760029. The reversal of 51701760021 is 12006710715.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 51701760021 - 2¹¹ = 51701757973 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51701760029) 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, 8616960001 + ... + 8616960006.

It is an arithmetic number, because the mean of its divisors is an integer number (17233920008).

Almost surely, 2^51701760021 is an apocalyptic number.

It is an amenable number.

51701760021 is a deficient number, since it is larger than the sum of its proper divisors (17233920011).

51701760021 is a wasteful number, since it uses less digits than its factorization.

51701760021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17233920010.

The product of its (nonzero) digits is 2940, while the sum is 30.

The spelling of 51701760021 in words is "fifty-one billion, seven hundred one million, seven hundred sixty thousand, twenty-one".