121220122020100 has 72 divisors (see below), whose sum is σ = 263220497129408. Its totient is φ = 48456198172800.

The previous prime is 121220122020097. The next prime is 121220122020163. The reversal of 121220122020100 is 1020221022121.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1353961537 + ... + 1354051063.

Almost surely, 2^{121220122020100} is an apocalyptic number.

121220122020100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121220122020100 is an abundant number, since it is smaller than the sum of its proper divisors (142000375109308).

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

121220122020100 is a wasteful number, since it uses less digits than its factorization.

121220122020100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98285 (or 98278 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 121220122020100 its reverse (1020221022121), we get a palindrome (122240343042221).

The spelling of 121220122020100 in words is "one hundred twenty-one trillion, two hundred twenty billion, one hundred twenty-two million, twenty thousand, one hundred".