211222311131231 has 4 divisors (see below), whose sum is σ = 222339274875000. Its totient is φ = 200105347387464.

The previous prime is 211222311131171. The next prime is 211222311131261. The reversal of 211222311131231 is 132131113222112.

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 211222311131231 - 2¹⁴ = 211222311114847 is a prime.

It is a super-2 number, since 2×211222311131231² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 211222311131231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211222311131261) 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, 5558481871856 + ... + 5558481871893.

It is an arithmetic number, because the mean of its divisors is an integer number (55584818718750).

Almost surely, 2^{211222311131231} is an apocalyptic number.

211222311131231 is a deficient number, since it is larger than the sum of its proper divisors (11116963743769).

211222311131231 is a wasteful number, since it uses less digits than its factorization.

211222311131231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11116963743768.

The product of its digits is 864, while the sum is 26.

Adding to 211222311131231 its reverse (132131113222112), we get a palindrome (343353424353343).

The spelling of 211222311131231 in words is "two hundred eleven trillion, two hundred twenty-two billion, three hundred eleven million, one hundred thirty-one thousand, two hundred thirty-one".