213556225 has 12 divisors (see below), whose sum is σ = 265489084. Its totient is φ = 170406720.

The previous prime is 213556207. The next prime is 213556247. The reversal of 213556225 is 522655312.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 3538161 + 210018064 = 1881^2 + 14492^2 .

It is not a de Polignac number, because 213556225 - 2⁷ = 213556097 is a prime.

It is a super-2 number, since 2×213556225² = 91212522472501250, which contains 22 as substring.

It is a Duffinian 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, 834 + ... + 20683.

Almost surely, 2^213556225 is an apocalyptic number.

213556225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

213556225 is a deficient number, since it is larger than the sum of its proper divisors (51932859).

213556225 is a wasteful number, since it uses less digits than its factorization.

213556225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21924 (or 21919 counting only the distinct ones).

The product of its digits is 18000, while the sum is 31.

The square root of 213556225 is about 14613.5630494414. The cubic root of 213556225 is about 597.7286578953.

The spelling of 213556225 in words is "two hundred thirteen million, five hundred fifty-six thousand, two hundred twenty-five".