90912203021 has 4 divisors (see below), whose sum is σ = 91029813372. Its totient is φ = 90794592672.

The previous prime is 90912202951. The next prime is 90912203027. The reversal of 90912203021 is 12030221909.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 18975062500 + 71937140521 = 137750^2 + 268211^2 .

It is a cyclic number.

It is not a de Polignac number, because 90912203021 - 2³⁴ = 73732333837 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90912203027) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 58804016 + ... + 58805561.

It is an arithmetic number, because the mean of its divisors is an integer number (22757453343).

Almost surely, 2^90912203021 is an apocalyptic number.

It is an amenable number.

90912203021 is a deficient number, since it is larger than the sum of its proper divisors (117610351).

90912203021 is a wasteful number, since it uses less digits than its factorization.

90912203021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 117610350.

The product of its (nonzero) digits is 1944, while the sum is 29.

The spelling of 90912203021 in words is "ninety billion, nine hundred twelve million, two hundred three thousand, twenty-one".