121100203020 has 96 divisors (see below), whose sum is σ = 348456927168. Its totient is φ = 31401464832.

The previous prime is 121100203009. The next prime is 121100203027. The reversal of 121100203020 is 20302001121.

It is a super-3 number, since 3×121100203020³ (a number of 34 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 121100202987 and 121100203005.

It is not an unprimeable number, because it can be changed into a prime (121100203027) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3831522 + ... + 3862998.

It is an arithmetic number, because the mean of its divisors is an integer number (3629759658).

Almost surely, 2^121100203020 is an apocalyptic number.

121100203020 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 121100203020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (174228463584).

121100203020 is an abundant number, since it is smaller than the sum of its proper divisors (227356724148).

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

121100203020 is a wasteful number, since it uses less digits than its factorization.

121100203020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33259 (or 33257 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 12.

Adding to 121100203020 its reverse (20302001121), we get a palindrome (141402204141).

The spelling of 121100203020 in words is "one hundred twenty-one billion, one hundred million, two hundred three thousand, twenty".