121320231 has 4 divisors (see below), whose sum is σ = 161760312. Its totient is φ = 80880152.

The previous prime is 121320223. The next prime is 121320257. The reversal of 121320231 is 132023121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 132023121 = 3 ⋅44007707.

It is a cyclic number.

It is not a de Polignac number, because 121320231 - 2³ = 121320223 is a prime.

It is a super-2 number, since 2×121320231² = 29437196899786722, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 121320231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121320631) 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, 20220036 + ... + 20220041.

It is an arithmetic number, because the mean of its divisors is an integer number (40440078).

Almost surely, 2^121320231 is an apocalyptic number.

121320231 is a deficient number, since it is larger than the sum of its proper divisors (40440081).

121320231 is an equidigital number, since it uses as much as digits as its factorization.

121320231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40440080.

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 121320231 is about 11014.5463365497. The cubic root of 121320231 is about 495.0446934444.

Adding to 121320231 its reverse (132023121), we get a palindrome (253343352).

The spelling of 121320231 in words is "one hundred twenty-one million, three hundred twenty thousand, two hundred thirty-one".