1331121231020 has 48 divisors (see below), whose sum is σ = 3242372931840. Its totient is φ = 449572711104.

The previous prime is 1331121231007. The next prime is 1331121231043. The reversal of 1331121231020 is 201321211331.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 1331121230983 and 1331121231001.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 70945910 + ... + 70964669.

It is an arithmetic number, because the mean of its divisors is an integer number (67549436080).

Almost surely, 2^{1331121231020} is an apocalyptic number.

1331121231020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1331121231020 is an abundant number, since it is smaller than the sum of its proper divisors (1911251700820).

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

1331121231020 is a wasteful number, since it uses less digits than its factorization.

1331121231020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141910662 (or 141910660 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 20.

Adding to 1331121231020 its reverse (201321211331), we get a palindrome (1532442442351).

The spelling of 1331121231020 in words is "one trillion, three hundred thirty-one billion, one hundred twenty-one million, two hundred thirty-one thousand, twenty".