213311021231 has 32 divisors (see below), whose sum is σ = 266842791936. Its totient is φ = 165656988000.

The previous prime is 213311021213. The next prime is 213311021243. The reversal of 213311021231 is 132120113312.

It is a happy number.

It is not a de Polignac number, because 213311021231 - 2⁶ = 213311021167 is a prime.

It is a super-2 number, since 2×213311021231² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213311021831) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 31407446 + ... + 31414236.

It is an arithmetic number, because the mean of its divisors is an integer number (8338837248).

Almost surely, 2^213311021231 is an apocalyptic number.

213311021231 is a deficient number, since it is larger than the sum of its proper divisors (53531770705).

213311021231 is a wasteful number, since it uses less digits than its factorization.

213311021231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8123.

The product of its (nonzero) digits is 216, while the sum is 20.

Adding to 213311021231 its reverse (132120113312), we get a palindrome (345431134543).

The spelling of 213311021231 in words is "two hundred thirteen billion, three hundred eleven million, twenty-one thousand, two hundred thirty-one".