91022021212 has 12 divisors (see below), whose sum is σ = 159295625776. Its totient is φ = 45508985280.

The previous prime is 91022021183. The next prime is 91022021221. The reversal of 91022021212 is 21212022019.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 402864 + ... + 586807.

Almost surely, 2^91022021212 is an apocalyptic number.

It is an amenable number.

91022021212 is a deficient number, since it is larger than the sum of its proper divisors (68273604564).

91022021212 is a wasteful number, since it uses less digits than its factorization.

91022021212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1012668 (or 1012666 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 22.

The spelling of 91022021212 in words is "ninety-one billion, twenty-two million, twenty-one thousand, two hundred twelve".