1231211123220 has 192 divisors, whose sum is σ = 3752590786560. Its totient is φ = 299816335872.

The previous prime is 1231211123213. The next prime is 1231211123243. The reversal of 1231211123220 is 223211121321.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 30662797 + ... + 30702923.

It is an arithmetic number, because the mean of its divisors is an integer number (19544743680).

Almost surely, 2^{1231211123220} is an apocalyptic number.

1231211123220 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 1231211123220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1876295393280).

1231211123220 is an abundant number, since it is smaller than the sum of its proper divisors (2521379663340).

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

1231211123220 is a wasteful number, since it uses less digits than its factorization.

1231211123220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40574 (or 40572 counting only the distinct ones).

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

Adding to 1231211123220 its reverse (223211121321), we get a palindrome (1454422244541).

The spelling of 1231211123220 in words is "one trillion, two hundred thirty-one billion, two hundred eleven million, one hundred twenty-three thousand, two hundred twenty".