1211211311231 has 8 divisors (see below), whose sum is σ = 1275428236800. Its totient is φ = 1147041281880.

The previous prime is 1211211311221. The next prime is 1211211311249. The reversal of 1211211311231 is 1321131121121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1211211311231 is a prime.

It is a super-2 number, since 2×1211211311231² (a number of 25 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 (1211211311221) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11671025 + ... + 11774346.

It is an arithmetic number, because the mean of its divisors is an integer number (159428529600).

Almost surely, 2^{1211211311231} is an apocalyptic number.

1211211311231 is a deficient number, since it is larger than the sum of its proper divisors (64216925569).

1211211311231 is a wasteful number, since it uses less digits than its factorization.

1211211311231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23448109.

The product of its digits is 72, while the sum is 20.

Adding to 1211211311231 its reverse (1321131121121), we get a palindrome (2532342432352).

The spelling of 1211211311231 in words is "one trillion, two hundred eleven billion, two hundred eleven million, three hundred eleven thousand, two hundred thirty-one".