90951034021 has 2 divisors, whose sum is σ = 90951034022. Its totient is φ = 90951034020.

The previous prime is 90951034019. The next prime is 90951034039. The reversal of 90951034021 is 12043015909.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 50081964100 + 40869069921 = 223790^2 + 202161^2 .

It is an emirp because it is prime and its reverse (12043015909) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 90951034021 - 2¹ = 90951034019 is a prime.

Together with 90951034019, 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 (90951038021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45475517010 + 45475517011.

It is an arithmetic number, because the mean of its divisors is an integer number (45475517011).

Almost surely, 2^90951034021 is an apocalyptic number.

It is an amenable number.

90951034021 is a deficient number, since it is larger than the sum of its proper divisors (1).

90951034021 is an equidigital number, since it uses as much as digits as its factorization.

90951034021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9720, while the sum is 34.

The spelling of 90951034021 in words is "ninety billion, nine hundred fifty-one million, thirty-four thousand, twenty-one".