221894412 has 12 divisors (see below), whose sum is σ = 517753656. Its totient is φ = 73964800.

The previous prime is 221894347. The next prime is 221894417. The reversal of 221894412 is 214498122.

It is a tau number, because it is divible by the number of its divisors (12).

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (221894417) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9245589 + ... + 9245612.

It is an arithmetic number, because the mean of its divisors is an integer number (43146138).

Almost surely, 2^221894412 is an apocalyptic number.

It is an amenable number.

221894412 is an abundant number, since it is smaller than the sum of its proper divisors (295859244).

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

221894412 is a wasteful number, since it uses less digits than its factorization.

221894412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18491208 (or 18491206 counting only the distinct ones).

The product of its digits is 9216, while the sum is 33.

The square root of 221894412 is about 14896.1207030555. The cubic root of 221894412 is about 605.4088823544.

The spelling of 221894412 in words is "two hundred twenty-one million, eight hundred ninety-four thousand, four hundred twelve".