121310220 has 24 divisors (see below), whose sum is σ = 339668784. Its totient is φ = 32349376.

The previous prime is 121310197. The next prime is 121310251. The reversal of 121310220 is 22013121.

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 = 121310196 and 121310205.

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, 1010859 + ... + 1010978.

It is an arithmetic number, because the mean of its divisors is an integer number (14152866).

Almost surely, 2^121310220 is an apocalyptic number.

121310220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121310220 is an abundant number, since it is smaller than the sum of its proper divisors (218358564).

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

121310220 is a wasteful number, since it uses less digits than its factorization.

121310220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2021849 (or 2021847 counting only the distinct ones).

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

The square root of 121310220 is about 11014.0918826747. The cubic root of 121310220 is about 495.0310765103.

Adding to 121310220 its reverse (22013121), we get a palindrome (143323341).

The spelling of 121310220 in words is "one hundred twenty-one million, three hundred ten thousand, two hundred twenty".