121243664 has 20 divisors (see below), whose sum is σ = 243010860. Its totient is φ = 58531200.

The previous prime is 121243663. The next prime is 121243667. The reversal of 121243664 is 466342121.

It can be written as a sum of positive squares in 2 ways, for example, as 60715264 + 60528400 = 7792^2 + 7780^2 .

It is a Harshad number since it is a multiple of its sum of digits (29).

It is not an unprimeable number, because it can be changed into a prime (121243663) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 130187 + ... + 131114.

It is an arithmetic number, because the mean of its divisors is an integer number (12150543).

Almost surely, 2^121243664 is an apocalyptic number.

It is an amenable number.

121243664 is an abundant number, since it is smaller than the sum of its proper divisors (121767196).

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

121243664 is a wasteful number, since it uses less digits than its factorization.

121243664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 261338 (or 261332 counting only the distinct ones).

The product of its digits is 6912, while the sum is 29.

The square root of 121243664 is about 11011.0700660744. The cubic root of 121243664 is about 494.9405281746.

Adding to 121243664 its reverse (466342121), we get a palindrome (587585785).

The spelling of 121243664 in words is "one hundred twenty-one million, two hundred forty-three thousand, six hundred sixty-four".