91999022021122 has 4 divisors (see below), whose sum is σ = 137998533031686. Its totient is φ = 45999511010560.

The previous prime is 91999022021113. The next prime is 91999022021237. The reversal of 91999022021122 is 22112022099919.

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

It can be written as a sum of positive squares in only one way, i.e., 84377066118601 + 7621955902521 = 9185699^2 + 2760789^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22999755505279 + ... + 22999755505282.

Almost surely, 2^{91999022021122} is an apocalyptic number.

91999022021122 is a deficient number, since it is larger than the sum of its proper divisors (45999511010564).

91999022021122 is a wasteful number, since it uses less digits than its factorization.

91999022021122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45999511010563.

The product of its (nonzero) digits is 209952, while the sum is 49.

The spelling of 91999022021122 in words is "ninety-one trillion, nine hundred ninety-nine billion, twenty-two million, twenty-one thousand, one hundred twenty-two".