213111222031 has 4 divisors (see below), whose sum is σ = 213191735152. Its totient is φ = 213030708912.

The previous prime is 213111222017. The next prime is 213111222043. The reversal of 213111222031 is 130222111312.

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 213111222031 - 2¹¹ = 213111219983 is a prime.

It is a super-2 number, since 2×213111222031² (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 (213111222091) 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, 40252590 + ... + 40257883.

It is an arithmetic number, because the mean of its divisors is an integer number (53297933788).

Almost surely, 2^213111222031 is an apocalyptic number.

213111222031 is a deficient number, since it is larger than the sum of its proper divisors (80513121).

213111222031 is an equidigital number, since it uses as much as digits as its factorization.

213111222031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80513120.

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 213111222031 its reverse (130222111312), we get a palindrome (343333333343).

The spelling of 213111222031 in words is "two hundred thirteen billion, one hundred eleven million, two hundred twenty-two thousand, thirty-one".