223212156 has 12 divisors (see below), whose sum is σ = 520828392. Its totient is φ = 74404048.

The previous prime is 223212151. The next prime is 223212161. The reversal of 223212156 is 651212322.

It is an interprime number because it is at equal distance from previous prime (223212151) and next prime (223212161).

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-3 number, since 3×223212156³ (a number of 26 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (223212151) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 9300495 + ... + 9300518.

It is an arithmetic number, because the mean of its divisors is an integer number (43402366).

Almost surely, 2^223212156 is an apocalyptic number.

It is an amenable number.

223212156 is an abundant number, since it is smaller than the sum of its proper divisors (297616236).

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

223212156 is a wasteful number, since it uses less digits than its factorization.

223212156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18601020 (or 18601018 counting only the distinct ones).

The product of its digits is 1440, while the sum is 24.

The square root of 223212156 is about 14940.2863426375. The cubic root of 223212156 is about 606.6049465582.

Adding to 223212156 its reverse (651212322), we get a palindrome (874424478).

It can be divided in two parts, 22321215 and 6, that added together give a triangular number (22321221 = T₆₆₈₁).

The spelling of 223212156 in words is "two hundred twenty-three million, two hundred twelve thousand, one hundred fifty-six".