90313661221 has 4 divisors (see below), whose sum is σ = 103215612832. Its totient is φ = 77411709612.

The previous prime is 90313661197. The next prime is 90313661237. The reversal of 90313661221 is 12216631309.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 90313661221 - 2⁵ = 90313661189 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 (90313661521) 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 in 3 ways as a sum of consecutive naturals, for example, 6450975795 + ... + 6450975808.

It is an arithmetic number, because the mean of its divisors is an integer number (25803903208).

Almost surely, 2^90313661221 is an apocalyptic number.

It is an amenable number.

90313661221 is a deficient number, since it is larger than the sum of its proper divisors (12901951611).

90313661221 is a wasteful number, since it uses less digits than its factorization.

90313661221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12901951610.

The product of its (nonzero) digits is 11664, while the sum is 34.

The spelling of 90313661221 in words is "ninety billion, three hundred thirteen million, six hundred sixty-one thousand, two hundred twenty-one".