121323021 has 4 divisors (see below), whose sum is σ = 161764032. Its totient is φ = 80882012.

The previous prime is 121323017. The next prime is 121323029. The reversal of 121323021 is 120323121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 121323021 - 2² = 121323017 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121323029) 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, 20220501 + ... + 20220506.

It is an arithmetic number, because the mean of its divisors is an integer number (40441008).

Almost surely, 2^121323021 is an apocalyptic number.

It is an amenable number.

121323021 is a deficient number, since it is larger than the sum of its proper divisors (40441011).

121323021 is an equidigital number, since it uses as much as digits as its factorization.

121323021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40441010.

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

The square root of 121323021 is about 11014.6729865212. The cubic root of 121323021 is about 495.0484882610.

Adding to 121323021 its reverse (120323121), we get a palindrome (241646142).

The spelling of 121323021 in words is "one hundred twenty-one million, three hundred twenty-three thousand, twenty-one".