213123131 has 8 divisors (see below), whose sum is σ = 229650960. Its totient is φ = 196614432.

The previous prime is 213123121. The next prime is 213123137. The reversal of 213123131 is 131321312.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-213123131 is a prime.

It is a super-2 number, since 2×213123131² = 90842937934486322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (213123137) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25505 + ... + 32813.

It is an arithmetic number, because the mean of its divisors is an integer number (28706370).

Almost surely, 2^213123131 is an apocalyptic number.

213123131 is a deficient number, since it is larger than the sum of its proper divisors (16527829).

213123131 is a wasteful number, since it uses less digits than its factorization.

213123131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9565.

The product of its digits is 108, while the sum is 17.

The square root of 213123131 is about 14598.7373084113. The cubic root of 213123131 is about 597.3243180210.

Adding to 213123131 its reverse (131321312), we get a palindrome (344444443).

It can be divided in two parts, 213 and 123131, that multiplied together give a triangular number (26226903 = T₇₂₄₂).

The spelling of 213123131 in words is "two hundred thirteen million, one hundred twenty-three thousand, one hundred thirty-one".