1231211300000 has 432 divisors, whose sum is σ = 3367749684600. Its totient is φ = 442675200000.

The previous prime is 1231211299907. The next prime is 1231211300107. The reversal of 1231211300000 is 31121321.

It can be written as a sum of positive squares in 12 ways, for example, as 320324304784 + 910886995216 = 565972^2 + 954404^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 1173699476 + ... + 1173700524.

Almost surely, 2^{1231211300000} is an apocalyptic number.

1231211300000 is a gapful number since it is divisible by the number (10) 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 1231211300000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1683874842300).

1231211300000 is an abundant number, since it is smaller than the sum of its proper divisors (2136538384600).

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

1231211300000 is an equidigital number, since it uses as much as digits as its factorization.

1231211300000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1203 (or 1164 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 14.

Adding to 1231211300000 its reverse (31121321), we get a palindrome (1231242421321).

The spelling of 1231211300000 in words is "one trillion, two hundred thirty-one billion, two hundred eleven million, three hundred thousand".