213216925 has 12 divisors (see below), whose sum is σ = 264620340. Its totient is φ = 170424320.

The previous prime is 213216911. The next prime is 213216931. The reversal of 213216925 is 529612312.

It can be written as a sum of positive squares in 6 ways, for example, as 95667961 + 117548964 = 9781^2 + 10842^2 .

It is not a de Polignac number, because 213216925 - 2⁵ = 213216893 is a prime.

It is a super-2 number, since 2×213216925² = 90922914212911250, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 32199 + ... + 38251.

It is an arithmetic number, because the mean of its divisors is an integer number (22051695).

Almost surely, 2^213216925 is an apocalyptic number.

213216925 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

213216925 is a deficient number, since it is larger than the sum of its proper divisors (51403415).

213216925 is a wasteful number, since it uses less digits than its factorization.

213216925 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7472 (or 7467 counting only the distinct ones).

The product of its digits is 6480, while the sum is 31.

The square root of 213216925 is about 14601.9493561647. The cubic root of 213216925 is about 597.4119312550.

The spelling of 213216925 in words is "two hundred thirteen million, two hundred sixteen thousand, nine hundred twenty-five".