221281492 has 12 divisors (see below), whose sum is σ = 391002976. Its totient is φ = 109566360.

The previous prime is 221281453. The next prime is 221281493. The reversal of 221281492 is 294182122.

221281492 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a hoax number, since the sum of its digits (31) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221281493) 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, 268134 + ... + 268957.

Almost surely, 2^221281492 is an apocalyptic number.

It is an amenable number.

221281492 is a deficient number, since it is larger than the sum of its proper divisors (169721484).

221281492 is a wasteful number, since it uses less digits than its factorization.

221281492 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 537198 (or 537196 counting only the distinct ones).

The product of its digits is 4608, while the sum is 31.

The square root of 221281492 is about 14875.5333349766. The cubic root of 221281492 is about 604.8509452258.

The spelling of 221281492 in words is "two hundred twenty-one million, two hundred eighty-one thousand, four hundred ninety-two".