221994912 has 48 divisors (see below), whose sum is σ = 595147392. Its totient is φ = 72422400.

The previous prime is 221994893. The next prime is 221994923. The reversal of 221994912 is 219499122.

It is a tau number, because it is divible by the number of its divisors (48).

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, 20089 + ... + 29112.

It is an arithmetic number, because the mean of its divisors is an integer number (12398904).

Almost surely, 2^221994912 is an apocalyptic number.

It is an amenable number.

221994912 is an abundant number, since it is smaller than the sum of its proper divisors (373152480).

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

221994912 is a wasteful number, since it uses less digits than its factorization.

221994912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49261 (or 49253 counting only the distinct ones).

The product of its digits is 23328, while the sum is 39.

The square root of 221994912 is about 14899.4936826726. The cubic root of 221994912 is about 605.5002687766.

The spelling of 221994912 in words is "two hundred twenty-one million, nine hundred ninety-four thousand, nine hundred twelve".