221056286 has 24 divisors (see below), whose sum is σ = 365335272. Its totient is φ = 99484800.

The previous prime is 221056267. The next prime is 221056291. The reversal of 221056286 is 682650122.

221056286 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×221056286² = 97731763160227592, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 917126 + ... + 917366.

It is an arithmetic number, because the mean of its divisors is an integer number (15222303).

Almost surely, 2^221056286 is an apocalyptic number.

221056286 is a deficient number, since it is larger than the sum of its proper divisors (144278986).

221056286 is a wasteful number, since it uses less digits than its factorization.

221056286 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 668 (or 427 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 32.

The square root of 221056286 is about 14867.9617298404. The cubic root of 221056286 is about 604.6456828433.

The spelling of 221056286 in words is "two hundred twenty-one million, fifty-six thousand, two hundred eighty-six".