121020012221100 has 72 divisors (see below), whose sum is σ = 370748366867088. Its totient is φ = 30373650124800.

The previous prime is 121020012221047. The next prime is 121020012221111. The reversal of 121020012221100 is 1122210020121.

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 121020012221100.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11864701981 + ... + 11864712180.

It is an arithmetic number, because the mean of its divisors is an integer number (5149282873154).

Almost surely, 2^{121020012221100} is an apocalyptic number.

121020012221100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121020012221100 is an abundant number, since it is smaller than the sum of its proper divisors (249728354645988).

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

121020012221100 is a wasteful number, since it uses less digits than its factorization.

121020012221100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23729414195 (or 23729414188 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 121020012221100 its reverse (1122210020121), we get a palindrome (122142222241221).

The spelling of 121020012221100 in words is "one hundred twenty-one trillion, twenty billion, twelve million, two hundred twenty-one thousand, one hundred".