121232220 has 24 divisors (see below), whose sum is σ = 339450384. Its totient is φ = 32328576.

The previous prime is 121232213. The next prime is 121232231. The reversal of 121232220 is 22232121.

It is a happy number.

It is a super-2 number, since 2×121232220² = 29394502332256800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 121232220.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1010209 + ... + 1010328.

It is an arithmetic number, because the mean of its divisors is an integer number (14143766).

Almost surely, 2^121232220 is an apocalyptic number.

121232220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121232220 is an abundant number, since it is smaller than the sum of its proper divisors (218218164).

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

121232220 is a wasteful number, since it uses less digits than its factorization.

121232220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2020549 (or 2020547 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 121232220 is about 11010.5503949621. The cubic root of 121232220 is about 494.9249554636.

Adding to 121232220 its reverse (22232121), we get a palindrome (143464341).

Subtracting from 121232220 its reverse (22232121), we obtain a palindrome (99000099).

The spelling of 121232220 in words is "one hundred twenty-one million, two hundred thirty-two thousand, two hundred twenty".