213112031 has 4 divisors (see below), whose sum is σ = 232485864. Its totient is φ = 193738200.

The previous prime is 213112027. The next prime is 213112049. The reversal of 213112031 is 130211312.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 213112031 - 2² = 213112027 is a prime.

It is a super-2 number, since 2×213112031² = 90833475513889922, 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 = 213111997 and 213112015.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213112061) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9686900 + ... + 9686921.

It is an arithmetic number, because the mean of its divisors is an integer number (58121466).

Almost surely, 2^213112031 is an apocalyptic number.

213112031 is a deficient number, since it is larger than the sum of its proper divisors (19373833).

213112031 is a wasteful number, since it uses less digits than its factorization.

213112031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19373832.

The product of its (nonzero) digits is 36, while the sum is 14.

The square root of 213112031 is about 14598.3571335955. The cubic root of 213112031 is about 597.3139477794.

Adding to 213112031 its reverse (130211312), we get a palindrome (343323343).

The spelling of 213112031 in words is "two hundred thirteen million, one hundred twelve thousand, thirty-one".