121020111100 has 72 divisors (see below), whose sum is σ = 300935162528. Its totient is φ = 41381280000.

The previous prime is 121020111053. The next prime is 121020111137. The reversal of 121020111100 is 1111020121.

It is a super-3 number, since 3×121020111100³ (a number of 34 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a congruent number.

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, 29350 + ... + 492850.

Almost surely, 2^121020111100 is an apocalyptic number.

121020111100 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 121020111100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (150467581264).

121020111100 is an abundant number, since it is smaller than the sum of its proper divisors (179915051428).

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

121020111100 is a wasteful number, since it uses less digits than its factorization.

121020111100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 463895 (or 463888 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 10.

Adding to 121020111100 its reverse (1111020121), we get a palindrome (122131131221).

The spelling of 121020111100 in words is "one hundred twenty-one billion, twenty million, one hundred eleven thousand, one hundred".