213223131 has 16 divisors (see below), whose sum is σ = 344603520. Its totient is φ = 129225960.

The previous prime is 213223123. The next prime is 213223139. The reversal of 213223131 is 131322312.

It is an interprime number because it is at equal distance from previous prime (213223123) and next prime (213223139).

It is not a de Polignac number, because 213223131 - 2³ = 213223123 is a prime.

It is a super-2 number, since 2×213223131² = 90928207186886322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (213223139) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 358665 + ... + 359258.

It is an arithmetic number, because the mean of its divisors is an integer number (21537720).

Almost surely, 2^213223131 is an apocalyptic number.

213223131 is a deficient number, since it is larger than the sum of its proper divisors (131380389).

213223131 is a wasteful number, since it uses less digits than its factorization.

213223131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 717943 (or 717937 counting only the distinct ones).

The product of its digits is 216, while the sum is 18.

The square root of 213223131 is about 14602.1618604918. The cubic root of 213223131 is about 597.4177273904.

Adding to 213223131 its reverse (131322312), we get a palindrome (344545443).

The spelling of 213223131 in words is "two hundred thirteen million, two hundred twenty-three thousand, one hundred thirty-one".