213312031 has 8 divisors (see below), whose sum is σ = 225054720. Its totient is φ = 201620952.

The previous prime is 213312017. The next prime is 213312037. The reversal of 213312031 is 130213312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 213312031 - 2⁵ = 213311999 is a prime.

It is a super-2 number, since 2×213312031² = 91004045138689922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 213311996 and 213312014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213312037) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4255 + ... + 21088.

It is an arithmetic number, because the mean of its divisors is an integer number (28131840).

Almost surely, 2^213312031 is an apocalyptic number.

213312031 is a deficient number, since it is larger than the sum of its proper divisors (11742689).

213312031 is a wasteful number, since it uses less digits than its factorization.

213312031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25805.

The product of its (nonzero) digits is 108, while the sum is 16.

The square root of 213312031 is about 14605.2056130682. The cubic root of 213312031 is about 597.5007438002.

Adding to 213312031 its reverse (130213312), we get a palindrome (343525343).

The spelling of 213312031 in words is "two hundred thirteen million, three hundred twelve thousand, thirty-one".