1231121103020 has 24 divisors (see below), whose sum is σ = 2585500740144. Its totient is φ = 492420550976.

The previous prime is 1231121103011. The next prime is 1231121103073. The reversal of 1231121103020 is 203011211321.

It is a self number, because there is not a number n which added to its sum of digits gives 1231121103020.

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, 1379327 + ... + 2089206.

It is an arithmetic number, because the mean of its divisors is an integer number (107729197506).

Almost surely, 2^{1231121103020} is an apocalyptic number.

1231121103020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1231121103020 is an abundant number, since it is smaller than the sum of its proper divisors (1354379637124).

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

1231121103020 is a wasteful number, since it uses less digits than its factorization.

1231121103020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3486289 (or 3486287 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 1231121103020 its reverse (203011211321), we get a palindrome (1434132314341).

The spelling of 1231121103020 in words is "one trillion, two hundred thirty-one billion, one hundred twenty-one million, one hundred three thousand, twenty".