52210521721 has 4 divisors (see below), whose sum is σ = 52211423232. Its totient is φ = 52209620212.

The previous prime is 52210521677. The next prime is 52210521761. The reversal of 52210521721 is 12712501225.

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 a cyclic number.

It is not a de Polignac number, because 52210521721 - 2¹³ = 52210513529 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 52210521721.

It is not an unprimeable number, because it can be changed into a prime (52210521761) 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, 357445 + ... + 481858.

It is an arithmetic number, because the mean of its divisors is an integer number (13052855808).

Almost surely, 2^52210521721 is an apocalyptic number.

It is an amenable number.

52210521721 is a deficient number, since it is larger than the sum of its proper divisors (901511).

52210521721 is an equidigital number, since it uses as much as digits as its factorization.

52210521721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 901510.

The product of its (nonzero) digits is 2800, while the sum is 28.

The spelling of 52210521721 in words is "fifty-two billion, two hundred ten million, five hundred twenty-one thousand, seven hundred twenty-one".