1231121211232 has 96 divisors (see below), whose sum is σ = 2761363229184. Its totient is φ = 534825984000.

The previous prime is 1231121211197. The next prime is 1231121211233. The reversal of 1231121211232 is 2321121211321.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231121211233) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9790357 + ... + 9915307.

It is an arithmetic number, because the mean of its divisors is an integer number (28764200304).

Almost surely, 2^{1231121211232} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1231121211232, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1380681614592).

1231121211232 is an abundant number, since it is smaller than the sum of its proper divisors (1530242017952).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1231121211232 is a wasteful number, since it uses less digits than its factorization.

1231121211232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126212 (or 126204 counting only the distinct ones).

The product of its digits is 288, while the sum is 22.

Adding to 1231121211232 its reverse (2321121211321), we get a palindrome (3552242422553).

The spelling of 1231121211232 in words is "one trillion, two hundred thirty-one billion, one hundred twenty-one million, two hundred eleven thousand, two hundred thirty-two".