121213310100 has 144 divisors (see below), whose sum is σ = 371523096000. Its totient is φ = 30427038720.

The previous prime is 121213310047. The next prime is 121213310123. The reversal of 121213310100 is 1013312121.

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 121213310100.

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, 827176 + ... + 962624.

It is an arithmetic number, because the mean of its divisors is an integer number (2580021500).

Almost surely, 2^121213310100 is an apocalyptic number.

121213310100 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 121213310100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (185761548000).

121213310100 is an abundant number, since it is smaller than the sum of its proper divisors (250309785900).

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

121213310100 is a wasteful number, since it uses less digits than its factorization.

121213310100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135642 (or 135635 counting only the distinct ones).

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

Adding to 121213310100 its reverse (1013312121), we get a palindrome (122226622221).

The spelling of 121213310100 in words is "one hundred twenty-one billion, two hundred thirteen million, three hundred ten thousand, one hundred".