90921121111 has 4 divisors (see below), whose sum is σ = 93035565832. Its totient is φ = 88806676392.

The previous prime is 90921121099. The next prime is 90921121169. The reversal of 90921121111 is 11112112909.

It is a happy number.

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

It is not a de Polignac number, because 90921121111 - 2¹⁵ = 90921088343 is a prime.

It is a super-2 number, since 2×90921121111² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 90921121111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90921124111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1057222296 + ... + 1057222381.

It is an arithmetic number, because the mean of its divisors is an integer number (23258891458).

Almost surely, 2^90921121111 is an apocalyptic number.

90921121111 is a deficient number, since it is larger than the sum of its proper divisors (2114444721).

90921121111 is a wasteful number, since it uses less digits than its factorization.

90921121111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2114444720.

The product of its (nonzero) digits is 324, while the sum is 28.

The spelling of 90921121111 in words is "ninety billion, nine hundred twenty-one million, one hundred twenty-one thousand, one hundred eleven".