52639421621 has 2 divisors, whose sum is σ = 52639421622. Its totient is φ = 52639421620.

The previous prime is 52639421609. The next prime is 52639421657. The reversal of 52639421621 is 12612493625.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 29141904100 + 23497517521 = 170710^2 + 153289^2 .

It is a cyclic number.

It is not a de Polignac number, because 52639421621 - 2¹⁸ = 52639159477 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (52639421221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26319710810 + 26319710811.

It is an arithmetic number, because the mean of its divisors is an integer number (26319710811).

Almost surely, 2^52639421621 is an apocalyptic number.

It is an amenable number.

52639421621 is a deficient number, since it is larger than the sum of its proper divisors (1).

52639421621 is an equidigital number, since it uses as much as digits as its factorization.

52639421621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 155520, while the sum is 41.

The spelling of 52639421621 in words is "fifty-two billion, six hundred thirty-nine million, four hundred twenty-one thousand, six hundred twenty-one".