121220423 has 4 divisors (see below), whose sum is σ = 121247760. Its totient is φ = 121193088.

The previous prime is 121220413. The next prime is 121220441. The reversal of 121220423 is 324022121.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 121220423 - 2⁸ = 121220167 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121220413) 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, 5315 + ... + 16452.

It is an arithmetic number, because the mean of its divisors is an integer number (30311940).

Almost surely, 2^121220423 is an apocalyptic number.

121220423 is a deficient number, since it is larger than the sum of its proper divisors (27337).

121220423 is an equidigital number, since it uses as much as digits as its factorization.

121220423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27336.

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 121220423 is about 11010.0146684734. The cubic root of 121220423 is about 494.9089013731.

Adding to 121220423 its reverse (324022121), we get a palindrome (445242544).

The spelling of 121220423 in words is "one hundred twenty-one million, two hundred twenty thousand, four hundred twenty-three".