1231231212120 has 128 divisors (see below), whose sum is σ = 4546084515840. Its totient is φ = 259776253440.

The previous prime is 1231231212109. The next prime is 1231231212149. The reversal of 1231231212120 is 212121321321.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

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, 56364136 + ... + 56385975.

It is an arithmetic number, because the mean of its divisors is an integer number (35516285280).

Almost surely, 2^{1231231212120} is an apocalyptic number.

1231231212120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1231231212120 is an abundant number, since it is smaller than the sum of its proper divisors (3314853303720).

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

1231231212120 is a wasteful number, since it uses less digits than its factorization.

1231231212120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112750145 (or 112750141 counting only the distinct ones).

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

Adding to 1231231212120 its reverse (212121321321), we get a palindrome (1443352533441).

The spelling of 1231231212120 in words is "one trillion, two hundred thirty-one billion, two hundred thirty-one million, two hundred twelve thousand, one hundred twenty".