91221132 has 24 divisors (see below), whose sum is σ = 218603056. Its totient is φ = 29585088.

The previous prime is 91221101. The next prime is 91221149. The reversal of 91221132 is 23112219.

It is a super-2 number, since 2×91221132² = 16642589846722848, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 91221099 and 91221108.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 102283 + ... + 103170.

Almost surely, 2^91221132 is an apocalyptic number.

It is an amenable number.

91221132 is an abundant number, since it is smaller than the sum of its proper divisors (127381924).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

91221132 is a wasteful number, since it uses less digits than its factorization.

91221132 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 205497 (or 205495 counting only the distinct ones).

The product of its digits is 216, while the sum is 21.

The square root of 91221132 is about 9550.9754475656. The cubic root of 91221132 is about 450.1581863623.

The spelling of 91221132 in words is "ninety-one million, two hundred twenty-one thousand, one hundred thirty-two".