121012321 has 4 divisors (see below), whose sum is σ = 122372100. Its totient is φ = 119652544.

The previous prime is 121012291. The next prime is 121012327. The reversal of 121012321 is 123210121.

121012321 is an esthetic number in base 10, because in such base its adjacent digits differ by 1.

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

It can be written as a sum of positive squares in 2 ways, for example, as 24206400 + 96805921 = 4920^2 + 9839^2 .

It is a cyclic number.

It is not a de Polignac number, because 121012321 - 2⁷ = 121012193 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121012327) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 679756 + ... + 679933.

It is an arithmetic number, because the mean of its divisors is an integer number (30593025).

Almost surely, 2^121012321 is an apocalyptic number.

It is an amenable number.

121012321 is a deficient number, since it is larger than the sum of its proper divisors (1359779).

121012321 is an equidigital number, since it uses as much as digits as its factorization.

121012321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1359778.

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

The square root of 121012321 is about 11000.5600311984. The cubic root of 121012321 is about 494.6255318387.

Adding to 121012321 its reverse (123210121), we get a palindrome (244222442).

It can be divided in two parts, 1210 and 12321, that added together give a palindrome (13531).

The spelling of 121012321 in words is "one hundred twenty-one million, twelve thousand, three hundred twenty-one".