121102020 has 144 divisors (see below), whose sum is σ = 408280320. Its totient is φ = 29787264.

The previous prime is 121102013. The next prime is 121102021. The reversal of 121102020 is 20201121.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 121101993 and 121102011.

It is not an unprimeable number, because it can be changed into a prime (121102021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 90597 + ... + 91923.

It is an arithmetic number, because the mean of its divisors is an integer number (2835280).

Almost surely, 2^121102020 is an apocalyptic number.

121102020 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 121102020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (204140160).

121102020 is an abundant number, since it is smaller than the sum of its proper divisors (287178300).

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

121102020 is a wasteful number, since it uses less digits than its factorization.

121102020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1371 (or 1350 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

The square root of 121102020 is about 11004.6362956710. The cubic root of 121102020 is about 494.7477134960.

Adding to 121102020 its reverse (20201121), we get a palindrome (141303141).

The spelling of 121102020 in words is "one hundred twenty-one million, one hundred two thousand, twenty".