1213131322100 has 36 divisors (see below), whose sum is σ = 2633656685184. Its totient is φ = 485038387680.

The previous prime is 1213131322099. The next prime is 1213131322133. The reversal of 1213131322100 is 12231313121.

It is a happy number.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2448932 + ... + 2902331.

It is an arithmetic number, because the mean of its divisors is an integer number (73157130144).

Almost surely, 2^{1213131322100} is an apocalyptic number.

1213131322100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1213131322100 is an abundant number, since it is smaller than the sum of its proper divisors (1420525363084).

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

1213131322100 is a wasteful number, since it uses less digits than its factorization.

1213131322100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5353544 (or 5353537 counting only the distinct ones).

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

Adding to 1213131322100 its reverse (12231313121), we get a palindrome (1225362635221).

The spelling of 1213131322100 in words is "one trillion, two hundred thirteen billion, one hundred thirty-one million, three hundred twenty-two thousand, one hundred".