502638805421 has 2 divisors, whose sum is σ = 502638805422. Its totient is φ = 502638805420.

The previous prime is 502638805379. The next prime is 502638805451. The reversal of 502638805421 is 124508836205.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 447747001321 + 54891804100 = 669139^2 + 234290^2 .

It is a cyclic number.

It is not a de Polignac number, because 502638805421 - 2¹⁰ = 502638804397 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (502638805451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 251319402710 + 251319402711.

It is an arithmetic number, because the mean of its divisors is an integer number (251319402711).

Almost surely, 2^502638805421 is an apocalyptic number.

It is an amenable number.

502638805421 is a deficient number, since it is larger than the sum of its proper divisors (1).

502638805421 is an equidigital number, since it uses as much as digits as its factorization.

502638805421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 460800, while the sum is 44.

The spelling of 502638805421 in words is "five hundred two billion, six hundred thirty-eight million, eight hundred five thousand, four hundred twenty-one".