201221992 has 16 divisors (see below), whose sum is σ = 389462400. Its totient is φ = 97365360.

The previous prime is 201221959. The next prime is 201222001. The reversal of 201221992 is 299122102.

It is a self number, because there is not a number n which added to its sum of digits gives 201221992.

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, 405442 + ... + 405937.

It is an arithmetic number, because the mean of its divisors is an integer number (24341400).

Almost surely, 2^201221992 is an apocalyptic number.

It is an amenable number.

201221992 is a deficient number, since it is larger than the sum of its proper divisors (188240408).

201221992 is a wasteful number, since it uses less digits than its factorization.

201221992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 811416 (or 811412 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 28.

The square root of 201221992 is about 14185.2737724726. The cubic root of 201221992 is about 585.9921721980.

The spelling of 201221992 in words is "two hundred one million, two hundred twenty-one thousand, nine hundred ninety-two".