1211330120231 has 32 divisors (see below), whose sum is σ = 1512047443968. Its totient is φ = 942758454240.

The previous prime is 1211330120183. The next prime is 1211330120237. The reversal of 1211330120231 is 1320210331121.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1211330120231 - 2²⁶ = 1211263011367 is a prime.

It is a super-2 number, since 2×1211330120231² (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 (1211330120237) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 432153476 + ... + 432156278.

It is an arithmetic number, because the mean of its divisors is an integer number (47251482624).

Almost surely, 2^{1211330120231} is an apocalyptic number.

1211330120231 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1211330120231 is a deficient number, since it is larger than the sum of its proper divisors (300717323737).

1211330120231 is a wasteful number, since it uses less digits than its factorization.

1211330120231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7571.

The product of its (nonzero) digits is 216, while the sum is 20.

Adding to 1211330120231 its reverse (1320210331121), we get a palindrome (2531540451352).

The spelling of 1211330120231 in words is "one trillion, two hundred eleven billion, three hundred thirty million, one hundred twenty thousand, two hundred thirty-one".