1321011302100 has 144 divisors (see below), whose sum is σ = 4368833376768. Its totient is φ = 301897791360.

The previous prime is 1321011302089. The next prime is 1321011302113. The reversal of 1321011302100 is 12031101231.

It is a happy number.

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 1321011302100.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 14240067 + ... + 14332533.

It is an arithmetic number, because the mean of its divisors is an integer number (30339120672).

Almost surely, 2^{1321011302100} is an apocalyptic number.

1321011302100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1321011302100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2184416688384).

1321011302100 is an abundant number, since it is smaller than the sum of its proper divisors (3047822074668).

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

1321011302100 is a wasteful number, since it uses less digits than its factorization.

1321011302100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99294 (or 99287 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 15.

Adding to 1321011302100 its reverse (12031101231), we get a palindrome (1333042403331).

The spelling of 1321011302100 in words is "one trillion, three hundred twenty-one billion, eleven million, three hundred two thousand, one hundred".