121020210 has 128 divisors (see below), whose sum is σ = 335923200. Its totient is φ = 30985920.

The previous prime is 121020209. The next prime is 121020241. The reversal of 121020210 is 12020121.

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 = 121020192 and 121020201.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1130977 + ... + 1131083.

It is an arithmetic number, because the mean of its divisors is an integer number (2624400).

Almost surely, 2^121020210 is an apocalyptic number.

121020210 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 121020210, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (167961600).

121020210 is an abundant number, since it is smaller than the sum of its proper divisors (214902990).

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

121020210 is a wasteful number, since it uses less digits than its factorization.

121020210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 253 (or 247 counting only the distinct ones).

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

The square root of 121020210 is about 11000.9185980081. The cubic root of 121020210 is about 494.6362800997.

Adding to 121020210 its reverse (12020121), we get a palindrome (133040331).

The spelling of 121020210 in words is "one hundred twenty-one million, twenty thousand, two hundred ten".