231212121222231 has 12 divisors (see below), whose sum is σ = 334364591623608. Its totient is φ = 153960709085424.

The previous prime is 231212121222227. The next prime is 231212121222253. The reversal of 231212121222231 is 132222121212132.

231212121222231 is a `hidden beast` number, since 2 + 3 + 1 + 212 + 1 + 212 + 2 + 2 + 231 = 666.

It is not a de Polignac number, because 231212121222231 - 2² = 231212121222227 is a prime.

It is a super-2 number, since 2×231212121222231² (a number of 30 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 231212121222195 and 231212121222204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231212121262231) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15058747125 + ... + 15058762478.

It is an arithmetic number, because the mean of its divisors is an integer number (27863715968634).

Almost surely, 2^{231212121222231} is an apocalyptic number.

231212121222231 is a deficient number, since it is larger than the sum of its proper divisors (103152470401377).

231212121222231 is a wasteful number, since it uses less digits than its factorization.

231212121222231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30117510462 (or 30117510459 counting only the distinct ones).

The product of its digits is 2304, while the sum is 27.

Adding to 231212121222231 its reverse (132222121212132), we get a palindrome (363434242434363).

The spelling of 231212121222231 in words is "two hundred thirty-one trillion, two hundred twelve billion, one hundred twenty-one million, two hundred twenty-two thousand, two hundred thirty-one".