121321021 has 4 divisors (see below), whose sum is σ = 126595872. Its totient is φ = 116046172.

The previous prime is 121321019. The next prime is 121321043. The reversal of 121321021 is 120123121.

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 121321021 - 2¹ = 121321019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121320992 and 121321010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121321001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2637391 + ... + 2637436.

It is an arithmetic number, because the mean of its divisors is an integer number (31648968).

Almost surely, 2^121321021 is an apocalyptic number.

It is an amenable number.

121321021 is a deficient number, since it is larger than the sum of its proper divisors (5274851).

121321021 is an equidigital number, since it uses as much as digits as its factorization.

121321021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5274850.

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 121321021 is about 11014.5821981589. The cubic root of 121321021 is about 495.0457679683.

Adding to 121321021 its reverse (120123121), we get a palindrome (241444142).

The spelling of 121321021 in words is "one hundred twenty-one million, three hundred twenty-one thousand, twenty-one".