90008204621 has 2 divisors, whose sum is σ = 90008204622. Its totient is φ = 90008204620.

The previous prime is 90008204617. The next prime is 90008204711. The reversal of 90008204621 is 12640280009.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 62605044100 + 27403160521 = 250210^2 + 165539^2 .

It is a cyclic number.

It is not a de Polignac number, because 90008204621 - 2² = 90008204617 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90008204521) 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 as a sum of consecutive naturals, namely, 45004102310 + 45004102311.

It is an arithmetic number, because the mean of its divisors is an integer number (45004102311).

Almost surely, 2^90008204621 is an apocalyptic number.

It is an amenable number.

90008204621 is a deficient number, since it is larger than the sum of its proper divisors (1).

90008204621 is an equidigital number, since it uses as much as digits as its factorization.

90008204621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6912, while the sum is 32.

The spelling of 90008204621 in words is "ninety billion, eight million, two hundred four thousand, six hundred twenty-one".