52245451721 has 4 divisors (see below), whose sum is σ = 52246010832. Its totient is φ = 52244892612.

The previous prime is 52245451697. The next prime is 52245451747. The reversal of 52245451721 is 12715454225.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 52245451721 - 2²² = 52241257417 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (52245451781) 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, 101651 + ... + 338856.

It is an arithmetic number, because the mean of its divisors is an integer number (13061502708).

Almost surely, 2^52245451721 is an apocalyptic number.

It is an amenable number.

52245451721 is a deficient number, since it is larger than the sum of its proper divisors (559111).

52245451721 is a wasteful number, since it uses less digits than its factorization.

52245451721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 559110.

The product of its digits is 112000, while the sum is 38.

The spelling of 52245451721 in words is "fifty-two billion, two hundred forty-five million, four hundred fifty-one thousand, seven hundred twenty-one".