121121021210100 has 36 divisors (see below), whose sum is σ = 350443488035424. Its totient is φ = 32298938989280.

The previous prime is 121121021210053. The next prime is 121121021210131. The reversal of 121121021210100 is 1012120121121.

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 121121021210100.

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, 201868368384 + ... + 201868368983.

Almost surely, 2^{121121021210100} is an apocalyptic number.

121121021210100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121121021210100 is an abundant number, since it is smaller than the sum of its proper divisors (229322466825324).

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

121121021210100 is a wasteful number, since it uses less digits than its factorization.

121121021210100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 403736737384 (or 403736737377 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 121121021210100 its reverse (1012120121121), we get a palindrome (122133141331221).

The spelling of 121121021210100 in words is "one hundred twenty-one trillion, one hundred twenty-one billion, twenty-one million, two hundred ten thousand, one hundred".