222255621 has 36 divisors (see below), whose sum is σ = 381431232. Its totient is φ = 124289424.

The previous prime is 222255619. The next prime is 222255643. The reversal of 222255621 is 126552222.

It is not a de Polignac number, because 222255621 - 2¹ = 222255619 is a prime.

It is a super-2 number, since 2×222255621² = 98795122132191282, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (222255661) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 15366 + ... + 26088.

It is an arithmetic number, because the mean of its divisors is an integer number (10595312).

Almost surely, 2^222255621 is an apocalyptic number.

222255621 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

222255621 is a deficient number, since it is larger than the sum of its proper divisors (159175611).

222255621 is a wasteful number, since it uses less digits than its factorization.

222255621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10790 (or 10780 counting only the distinct ones).

The product of its digits is 4800, while the sum is 27.

The square root of 222255621 is about 14908.2400369728. The cubic root of 222255621 is about 605.7372075607.

The spelling of 222255621 in words is "two hundred twenty-two million, two hundred fifty-five thousand, six hundred twenty-one".