52397761021 has 4 divisors (see below), whose sum is σ = 52402824700. Its totient is φ = 52392697344.

The previous prime is 52397760979. The next prime is 52397761027. The reversal of 52397761021 is 12016779325.

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 2183225625 + 50214535396 = 46725^2 + 224086^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-52397761021 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 (52397761027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2516286 + ... + 2537023.

It is an arithmetic number, because the mean of its divisors is an integer number (13100706175).

Almost surely, 2^52397761021 is an apocalyptic number.

It is an amenable number.

52397761021 is a deficient number, since it is larger than the sum of its proper divisors (5063679).

52397761021 is a wasteful number, since it uses less digits than its factorization.

52397761021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5063678.

The product of its (nonzero) digits is 158760, while the sum is 43.

The spelling of 52397761021 in words is "fifty-two billion, three hundred ninety-seven million, seven hundred sixty-one thousand, twenty-one".