121323663 has 20 divisors (see below), whose sum is σ = 182342160. Its totient is φ = 80389152.

The previous prime is 121323661. The next prime is 121323701. The reversal of 121323663 is 366323121.

It is a happy number.

It is not a de Polignac number, because 121323663 - 2¹ = 121323661 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121323661) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 9043 + ... + 18011.

It is an arithmetic number, because the mean of its divisors is an integer number (9117108).

Almost surely, 2^121323663 is an apocalyptic number.

121323663 is a deficient number, since it is larger than the sum of its proper divisors (61018497).

121323663 is an equidigital number, since it uses as much as digits as its factorization.

121323663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9148 (or 9139 counting only the distinct ones).

The product of its digits is 3888, while the sum is 27.

The square root of 121323663 is about 11014.7021294268. The cubic root of 121323663 is about 495.0493614687.

Adding to 121323663 its reverse (366323121), we get a palindrome (487646784).

The spelling of 121323663 in words is "one hundred twenty-one million, three hundred twenty-three thousand, six hundred sixty-three".