221151994 has 32 divisors (see below), whose sum is σ = 389232000. Its totient is φ = 94197600.

The previous prime is 221151977. The next prime is 221152013. The reversal of 221151994 is 499151122.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 121894 + ... + 123694.

It is an arithmetic number, because the mean of its divisors is an integer number (12163500).

Almost surely, 2^221151994 is an apocalyptic number.

221151994 is a deficient number, since it is larger than the sum of its proper divisors (168080006).

221151994 is a wasteful number, since it uses less digits than its factorization.

221151994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2003 (or 1989 counting only the distinct ones).

The product of its digits is 6480, while the sum is 34.

The square root of 221151994 is about 14871.1799800823. The cubic root of 221151994 is about 604.7329322349.

The spelling of 221151994 in words is "two hundred twenty-one million, one hundred fifty-one thousand, nine hundred ninety-four".