121221020201100 has 72 divisors (see below), whose sum is σ = 351634445569680. Its totient is φ = 32242506113280.

The previous prime is 121221020201053. The next prime is 121221020201137. The reversal of 121221020201100 is 1102020122121.

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 121221020201100.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 519253567 + ... + 519486966.

Almost surely, 2^{121221020201100} is an apocalyptic number.

121221020201100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121221020201100 is an abundant number, since it is smaller than the sum of its proper divisors (230413425368580).

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

121221020201100 is a wasteful number, since it uses less digits than its factorization.

121221020201100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1038740939 (or 1038740932 counting only the distinct ones).

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

Adding to 121221020201100 its reverse (1102020122121), we get a palindrome (122323040323221).

The spelling of 121221020201100 in words is "one hundred twenty-one trillion, two hundred twenty-one billion, twenty million, two hundred one thousand, one hundred".