121252220 has 24 divisors (see below), whose sum is σ = 255201408. Its totient is φ = 48392000.

The previous prime is 121252213. The next prime is 121252247. The reversal of 121252220 is 22252121.

It is a congruent number.

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, 2645 + ... + 15795.

It is an arithmetic number, because the mean of its divisors is an integer number (10633392).

Almost surely, 2^121252220 is an apocalyptic number.

121252220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121252220 is an abundant number, since it is smaller than the sum of its proper divisors (133949188).

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

121252220 is a wasteful number, since it uses less digits than its factorization.

121252220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13621 (or 13619 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 17.

The square root of 121252220 is about 11011.4585773184. The cubic root of 121252220 is about 494.9521703267.

Subtracting from 121252220 its reverse (22252121), we obtain a palindrome (99000099).

The spelling of 121252220 in words is "one hundred twenty-one million, two hundred fifty-two thousand, two hundred twenty".