121231023 has 4 divisors (see below), whose sum is σ = 161641368. Its totient is φ = 80820680.

The previous prime is 121231021. The next prime is 121231031. The reversal of 121231023 is 320132121.

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 121231023 - 2¹ = 121231021 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 121230993 and 121231011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121231021) 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, 20205168 + ... + 20205173.

It is an arithmetic number, because the mean of its divisors is an integer number (40410342).

Almost surely, 2^121231023 is an apocalyptic number.

121231023 is a deficient number, since it is larger than the sum of its proper divisors (40410345).

121231023 is an equidigital number, since it uses as much as digits as its factorization.

121231023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40410344.

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

The square root of 121231023 is about 11010.4960378722. The cubic root of 121231023 is about 494.9233265591.

Adding to 121231023 its reverse (320132121), we get a palindrome (441363144).

The spelling of 121231023 in words is "one hundred twenty-one million, two hundred thirty-one thousand, twenty-three".