91222212122 has 4 divisors (see below), whose sum is σ = 136833318186. Its totient is φ = 45611106060.

The previous prime is 91222212061. The next prime is 91222212139. The reversal of 91222212122 is 22121222219.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 22121222219 = 503 ⋅43978573.

It can be written as a sum of positive squares in only one way, i.e., 90161472361 + 1060739761 = 300269^2 + 32569^2 .

It is a junction number, because it is equal to n+sod(n) for n = 91222212091 and 91222212100.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 22805553029 + ... + 22805553032.

Almost surely, 2^91222212122 is an apocalyptic number.

91222212122 is a deficient number, since it is larger than the sum of its proper divisors (45611106064).

91222212122 is a wasteful number, since it uses less digits than its factorization.

91222212122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45611106063.

The product of its digits is 1152, while the sum is 26.

The spelling of 91222212122 in words is "ninety-one billion, two hundred twenty-two million, two hundred twelve thousand, one hundred twenty-two".