213011111031 has 4 divisors (see below), whose sum is σ = 284014814712. Its totient is φ = 142007407352.

The previous prime is 213011110993. The next prime is 213011111039. The reversal of 213011111031 is 130111110312.

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 213011111031 - 2⁷ = 213011110903 is a prime.

It is a super-2 number, since 2×213011111031² (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 213011111031.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213011111039) 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, 35501851836 + ... + 35501851841.

It is an arithmetic number, because the mean of its divisors is an integer number (71003703678).

Almost surely, 2^213011111031 is an apocalyptic number.

213011111031 is a deficient number, since it is larger than the sum of its proper divisors (71003703681).

213011111031 is an equidigital number, since it uses as much as digits as its factorization.

213011111031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71003703680.

The product of its (nonzero) digits is 18, while the sum is 15.

Adding to 213011111031 its reverse (130111110312), we get a palindrome (343122221343).

It can be divided in two parts, 2 and 13011111031, that multiplied together give a palindrome (26022222062).

The spelling of 213011111031 in words is "two hundred thirteen billion, eleven million, one hundred eleven thousand, thirty-one".