121021120100 has 72 divisors (see below), whose sum is σ = 272143915008. Its totient is φ = 46664294400.

The previous prime is 121021120091. The next prime is 121021120109. The reversal of 121021120100 is 1021120121.

It is an interprime number because it is at equal distance from previous prime (121021120091) and next prime (121021120109).

It is a super-2 number, since 2×121021120100² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (121021120109) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 720749 + ... + 872651.

Almost surely, 2^121021120100 is an apocalyptic number.

121021120100 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 121021120100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (136071957504).

121021120100 is an abundant number, since it is smaller than the sum of its proper divisors (151122794908).

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

121021120100 is a wasteful number, since it uses less digits than its factorization.

121021120100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 152205 (or 152198 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 121021120100 its reverse (1021120121), we get a palindrome (122042240221).

The spelling of 121021120100 in words is "one hundred twenty-one billion, twenty-one million, one hundred twenty thousand, one hundred".