213220111031 has 4 divisors (see below), whose sum is σ = 213309364200. Its totient is φ = 213130857864.

The previous prime is 213220111021. The next prime is 213220111037. The reversal of 213220111031 is 130111022312.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-213220111031 is a prime.

It is a super-2 number, since 2×213220111031² (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 (213220111037) 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, 44623001 + ... + 44627778.

It is an arithmetic number, because the mean of its divisors is an integer number (53327341050).

Almost surely, 2^213220111031 is an apocalyptic number.

213220111031 is a deficient number, since it is larger than the sum of its proper divisors (89253169).

213220111031 is an equidigital number, since it uses as much as digits as its factorization.

213220111031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89253168.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 213220111031 its reverse (130111022312), we get a palindrome (343331133343).

The spelling of 213220111031 in words is "two hundred thirteen billion, two hundred twenty million, one hundred eleven thousand, thirty-one".