1231201212132 has 96 divisors (see below), whose sum is σ = 3083813978112. Its totient is φ = 381316104576.

The previous prime is 1231201212089. The next prime is 1231201212191. The reversal of 1231201212132 is 2312121021321.

It is a junction number, because it is equal to n+sod(n) for n = 1231201212099 and 1231201212108.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6099373 + ... + 6297995.

It is an arithmetic number, because the mean of its divisors is an integer number (32123062272).

Almost surely, 2^{1231201212132} is an apocalyptic number.

1231201212132 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1231201212132, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1541906989056).

1231201212132 is an abundant number, since it is smaller than the sum of its proper divisors (1852612765980).

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

1231201212132 is a wasteful number, since it uses less digits than its factorization.

1231201212132 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 199297 (or 199295 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 21.

Adding to 1231201212132 its reverse (2312121021321), we get a palindrome (3543322233453).

The spelling of 1231201212132 in words is "one trillion, two hundred thirty-one billion, two hundred one million, two hundred twelve thousand, one hundred thirty-two".