121203220 has 24 divisors (see below), whose sum is σ = 254809800. Its totient is φ = 48427392.

The previous prime is 121203193. The next prime is 121203347. The reversal of 121203220 is 22302121.

It can be written as a sum of positive squares in 4 ways, for example, as 3437316 + 117765904 = 1854^2 + 10852^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 121203220.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18546 + ... + 24214.

It is an arithmetic number, because the mean of its divisors is an integer number (10617075).

Almost surely, 2^121203220 is an apocalyptic number.

121203220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121203220 is an abundant number, since it is smaller than the sum of its proper divisors (133606580).

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

121203220 is a wasteful number, since it uses less digits than its factorization.

121203220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6747 (or 6745 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 121203220 is about 11009.2333974714. The cubic root of 121203220 is about 494.8854885949.

Adding to 121203220 its reverse (22302121), we get a palindrome (143505341).

The spelling of 121203220 in words is "one hundred twenty-one million, two hundred three thousand, two hundred twenty".