1231122120 has 32 divisors (see below), whose sum is σ = 3693366720. Its totient is φ = 328299200.

The previous prime is 1231122097. The next prime is 1231122187. The reversal of 1231122120 is 212211321.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 1231122120.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5129556 + ... + 5129795.

It is an arithmetic number, because the mean of its divisors is an integer number (115417710).

Almost surely, 2^1231122120 is an apocalyptic number.

1231122120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1231122120 is an abundant number, since it is smaller than the sum of its proper divisors (2462244600).

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

1231122120 is a wasteful number, since it uses less digits than its factorization.

1231122120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10259365 (or 10259361 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 15.

The square root of 1231122120 is about 35087.3498571779. The cubic root of 1231122120 is about 1071.7669933359.

Adding to 1231122120 its reverse (212211321), we get a palindrome (1443333441).

The spelling of 1231122120 in words is "one billion, two hundred thirty-one million, one hundred twenty-two thousand, one hundred twenty".