221294286 has 12 divisors (see below), whose sum is σ = 479470992. Its totient is φ = 73764756.

The previous prime is 221294267. The next prime is 221294323. The reversal of 221294286 is 682492122.

221294286 is a `hidden beast` number, since 221 + 2 + 9 + 428 + 6 = 666.

It is a super-2 number, since 2×221294286² = 97942322032499592, which contains 22 as substring.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 221294286.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6147046 + ... + 6147081.

It is an arithmetic number, because the mean of its divisors is an integer number (39955916).

Almost surely, 2^221294286 is an apocalyptic number.

221294286 is an abundant number, since it is smaller than the sum of its proper divisors (258176706).

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

221294286 is a wasteful number, since it uses less digits than its factorization.

221294286 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12294135 (or 12294132 counting only the distinct ones).

The product of its digits is 27648, while the sum is 36.

The square root of 221294286 is about 14875.9633637624. The cubic root of 221294286 is about 604.8626020433.

The spelling of 221294286 in words is "two hundred twenty-one million, two hundred ninety-four thousand, two hundred eighty-six".