221021942 has 16 divisors (see below), whose sum is σ = 341945280. Its totient is φ = 107065728.

The previous prime is 221021929. The next prime is 221021951. The reversal of 221021942 is 249120122.

It is a congruent number.

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, 11438 + ... + 23934.

It is an arithmetic number, because the mean of its divisors is an integer number (21371580).

Almost surely, 2^221021942 is an apocalyptic number.

221021942 is a deficient number, since it is larger than the sum of its proper divisors (120923338).

221021942 is a wasteful number, since it uses less digits than its factorization.

221021942 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12775.

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 221021942 is about 14866.8067183239. The cubic root of 221021942 is about 604.6143680031.

The spelling of 221021942 in words is "two hundred twenty-one million, twenty-one thousand, nine hundred forty-two".