1323111021020 has 48 divisors (see below), whose sum is σ = 2942453884608. Its totient is φ = 498031518720.

The previous prime is 1323111021017. The next prime is 1323111021047. The reversal of 1323111021020 is 201201113231.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a self number, because there is not a number n which added to its sum of digits gives 1323111021020.

It is a congruent number.

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, 1802369 + ... + 2427911.

It is an arithmetic number, because the mean of its divisors is an integer number (61301122596).

Almost surely, 2^{1323111021020} is an apocalyptic number.

1323111021020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1323111021020 is an abundant number, since it is smaller than the sum of its proper divisors (1619342863588).

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

1323111021020 is a wasteful number, since it uses less digits than its factorization.

1323111021020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 631790 (or 631788 counting only the distinct ones).

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

Adding to 1323111021020 its reverse (201201113231), we get a palindrome (1524312134251).

The spelling of 1323111021020 in words is "one trillion, three hundred twenty-three billion, one hundred eleven million, twenty-one thousand, twenty".