221851994 has 32 divisors (see below), whose sum is σ = 411438720. Its totient is φ = 87365952.

The previous prime is 221851957. The next prime is 221852077. The reversal of 221851994 is 499158122.

221851994 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Curzon 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, 39017 + ... + 44339.

It is an arithmetic number, because the mean of its divisors is an integer number (12857460).

Almost surely, 2^221851994 is an apocalyptic number.

221851994 is a deficient number, since it is larger than the sum of its proper divisors (189586726).

221851994 is a wasteful number, since it uses less digits than its factorization.

221851994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5574.

The product of its digits is 51840, while the sum is 41.

The square root of 221851994 is about 14894.6968414936. The cubic root of 221851994 is about 605.3703026379.

The spelling of 221851994 in words is "two hundred twenty-one million, eight hundred fifty-one thousand, nine hundred ninety-four".