121331620 has 12 divisors (see below), whose sum is σ = 254796444. Its totient is φ = 48532640.

The previous prime is 121331531. The next prime is 121331627. The reversal of 121331620 is 26133121.

It can be written as a sum of positive squares in 2 ways, for example, as 25644096 + 95687524 = 5064^2 + 9782^2 .

It is not an unprimeable number, because it can be changed into a prime (121331627) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 3033271 + ... + 3033310.

It is an arithmetic number, because the mean of its divisors is an integer number (21233037).

Almost surely, 2^121331620 is an apocalyptic number.

121331620 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121331620 is an abundant number, since it is smaller than the sum of its proper divisors (133464824).

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

121331620 is a wasteful number, since it uses less digits than its factorization.

121331620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6066590 (or 6066588 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 19.

The square root of 121331620 is about 11015.0633225597. The cubic root of 121331620 is about 495.0601838193.

Adding to 121331620 its reverse (26133121), we get a palindrome (147464741).

The spelling of 121331620 in words is "one hundred twenty-one million, three hundred thirty-one thousand, six hundred twenty".