1231131121000 has 64 divisors (see below), whose sum is σ = 3142742016960. Its totient is φ = 447684040000.

The previous prime is 1231131120979. The next prime is 1231131121013. The reversal of 1231131121000 is 1211311321.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 55949506 + ... + 55971505.

It is an arithmetic number, because the mean of its divisors is an integer number (49105344015).

Almost surely, 2^{1231131121000} is an apocalyptic number.

1231131121000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1231131121000 is an abundant number, since it is smaller than the sum of its proper divisors (1911610895960).

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

1231131121000 is a wasteful number, since it uses less digits than its factorization.

1231131121000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111921043 (or 111921029 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 16.

Adding to 1231131121000 its reverse (1211311321), we get a palindrome (1232342432321).

The spelling of 1231131121000 in words is "one trillion, two hundred thirty-one billion, one hundred thirty-one million, one hundred twenty-one thousand".