213120101031 has 4 divisors (see below), whose sum is σ = 284160134712. Its totient is φ = 142080067352.

The previous prime is 213120101023. The next prime is 213120101057. The reversal of 213120101031 is 130101021312.

It is a happy number.

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 213120101031 - 2³ = 213120101023 is a prime.

It is a super-2 number, since 2×213120101031² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 213120101031.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213120100031) 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, 35520016836 + ... + 35520016841.

It is an arithmetic number, because the mean of its divisors is an integer number (71040033678).

Almost surely, 2^213120101031 is an apocalyptic number.

213120101031 is a deficient number, since it is larger than the sum of its proper divisors (71040033681).

213120101031 is an equidigital number, since it uses as much as digits as its factorization.

213120101031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71040033680.

The product of its (nonzero) digits is 36, while the sum is 15.

Adding to 213120101031 its reverse (130101021312), we get a palindrome (343221122343).

The spelling of 213120101031 in words is "two hundred thirteen billion, one hundred twenty million, one hundred one thousand, thirty-one".