90490557117421 has 2 divisors, whose sum is σ = 90490557117422. Its totient is φ = 90490557117420.

The previous prime is 90490557117413. The next prime is 90490557117427. The reversal of 90490557117421 is 12471175509409.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 82315881296100 + 8174675821321 = 9072810^2 + 2859139^2 .

It is a cyclic number.

It is not a de Polignac number, because 90490557117421 - 2³ = 90490557117413 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90490557117427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45245278558710 + 45245278558711.

It is an arithmetic number, because the mean of its divisors is an integer number (45245278558711).

Almost surely, 2^{90490557117421} is an apocalyptic number.

It is an amenable number.

90490557117421 is a deficient number, since it is larger than the sum of its proper divisors (1).

90490557117421 is an equidigital number, since it uses as much as digits as its factorization.

90490557117421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3175200, while the sum is 55.

The spelling of 90490557117421 in words is "ninety trillion, four hundred ninety billion, five hundred fifty-seven million, one hundred seventeen thousand, four hundred twenty-one".