213131101031 has 4 divisors (see below), whose sum is σ = 214022863200. Its totient is φ = 212239338864.

The previous prime is 213131100997. The next prime is 213131101061. The reversal of 213131101031 is 130101131312.

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 213131101031 - 2³⁰ = 212057359207 is a prime.

It is a super-2 number, since 2×213131101031² (a number of 23 digits) 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 (213131101061) 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, 445880726 + ... + 445881203.

It is an arithmetic number, because the mean of its divisors is an integer number (53505715800).

Almost surely, 2^213131101031 is an apocalyptic number.

213131101031 is a deficient number, since it is larger than the sum of its proper divisors (891762169).

213131101031 is an equidigital number, since it uses as much as digits as its factorization.

213131101031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 891762168.

The product of its (nonzero) digits is 54, while the sum is 17.

Adding to 213131101031 its reverse (130101131312), we get a palindrome (343232232343).

The spelling of 213131101031 in words is "two hundred thirteen billion, one hundred thirty-one million, one hundred one thousand, thirty-one".