121002220 has 24 divisors (see below), whose sum is σ = 254319408. Its totient is φ = 48360000.

The previous prime is 121002199. The next prime is 121002251. The reversal of 121002220 is 22200121.

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

It is a junction number, because it is equal to n+sod(n) for n = 121002197 and 121002206.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35595 + ... + 38845.

It is an arithmetic number, because the mean of its divisors is an integer number (10596642).

Almost surely, 2^121002220 is an apocalyptic number.

121002220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121002220 is an abundant number, since it is smaller than the sum of its proper divisors (133317188).

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

121002220 is a wasteful number, since it uses less digits than its factorization.

121002220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5121 (or 5119 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 10.

The square root of 121002220 is about 11000.1009086281. The cubic root of 121002220 is about 494.6117691863.

Adding to 121002220 its reverse (22200121), we get a palindrome (143202341).

The spelling of 121002220 in words is "one hundred twenty-one million, two thousand, two hundred twenty".