90021345361 has 2 divisors, whose sum is σ = 90021345362. Its totient is φ = 90021345360.

The previous prime is 90021345353. The next prime is 90021345371. The reversal of 90021345361 is 16354312009.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 84114500625 + 5906844736 = 290025^2 + 76856^2 .

It is a cyclic number.

It is not a de Polignac number, because 90021345361 - 2³ = 90021345353 is a prime.

It is not a weakly prime, because it can be changed into another prime (90021345311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45010672680 + 45010672681.

It is an arithmetic number, because the mean of its divisors is an integer number (45010672681).

Almost surely, 2^90021345361 is an apocalyptic number.

It is an amenable number.

90021345361 is a deficient number, since it is larger than the sum of its proper divisors (1).

90021345361 is an equidigital number, since it uses as much as digits as its factorization.

90021345361 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 19440, while the sum is 34.

The spelling of 90021345361 in words is "ninety billion, twenty-one million, three hundred forty-five thousand, three hundred sixty-one".