90044916421 has 2 divisors, whose sum is σ = 90044916422. Its totient is φ = 90044916420.

The previous prime is 90044916419. The next prime is 90044916439. The reversal of 90044916421 is 12461944009.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 53817504196 + 36227412225 = 231986^2 + 190335^2 .

It is a cyclic number.

It is not a de Polignac number, because 90044916421 - 2¹ = 90044916419 is a prime.

Together with 90044916419, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90044916491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45022458210 + 45022458211.

It is an arithmetic number, because the mean of its divisors is an integer number (45022458211).

Almost surely, 2^90044916421 is an apocalyptic number.

It is an amenable number.

90044916421 is a deficient number, since it is larger than the sum of its proper divisors (1).

90044916421 is an equidigital number, since it uses as much as digits as its factorization.

90044916421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 62208, while the sum is 40.

The spelling of 90044916421 in words is "ninety billion, forty-four million, nine hundred sixteen thousand, four hundred twenty-one".