213311222131 has 4 divisors (see below), whose sum is σ = 243784253872. Its totient is φ = 182838190392.

The previous prime is 213311222123. The next prime is 213311222143. The reversal of 213311222131 is 131222113312.

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 213311222131 - 2³ = 213311222123 is a prime.

It is a super-2 number, since 2×213311222131² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (213311202131) 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, 15236515860 + ... + 15236515873.

It is an arithmetic number, because the mean of its divisors is an integer number (60946063468).

Almost surely, 2^213311222131 is an apocalyptic number.

213311222131 is a deficient number, since it is larger than the sum of its proper divisors (30473031741).

213311222131 is an equidigital number, since it uses as much as digits as its factorization.

213311222131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30473031740.

The product of its digits is 432, while the sum is 22.

Adding to 213311222131 its reverse (131222113312), we get a palindrome (344533335443).

The spelling of 213311222131 in words is "two hundred thirteen billion, three hundred eleven million, two hundred twenty-two thousand, one hundred thirty-one".