213102031 has 4 divisors (see below), whose sum is σ = 213336864. Its totient is φ = 212867200.

The previous prime is 213102013. The next prime is 213102047. The reversal of 213102031 is 130201312.

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 213102031 - 2²³ = 204713423 is a prime.

It is a super-2 number, since 2×213102031² = 90824951232649922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213102731) 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, 116050 + ... + 117871.

It is an arithmetic number, because the mean of its divisors is an integer number (53334216).

Almost surely, 2^213102031 is an apocalyptic number.

213102031 is a deficient number, since it is larger than the sum of its proper divisors (234833).

213102031 is an equidigital number, since it uses as much as digits as its factorization.

213102031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 234832.

The product of its (nonzero) digits is 36, while the sum is 13.

The square root of 213102031 is about 14598.0146252838. The cubic root of 213102031 is about 597.3046049111.

Adding to 213102031 its reverse (130201312), we get a palindrome (343303343).

The spelling of 213102031 in words is "two hundred thirteen million, one hundred two thousand, thirty-one".