1321000121 has 8 divisors (see below), whose sum is σ = 1517620224. Its totient is φ = 1126356480.

The previous prime is 1321000081. The next prime is 1321000127. The reversal of 1321000121 is 1210001231.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1321000121 - 2²⁶ = 1253891257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1321000127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 492680 + ... + 495353.

It is an arithmetic number, because the mean of its divisors is an integer number (189702528).

Almost surely, 2^1321000121 is an apocalyptic number.

It is an amenable number.

1321000121 is a deficient number, since it is larger than the sum of its proper divisors (196620103).

1321000121 is an equidigital number, since it uses as much as digits as its factorization.

1321000121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 988231.

The product of its (nonzero) digits is 12, while the sum is 11.

The square root of 1321000121 is about 36345.5653553498. The cubic root of 1321000121 is about 1097.2382844971.

Adding to 1321000121 its reverse (1210001231), we get a palindrome (2531001352).

The spelling of 1321000121 in words is "one billion, three hundred twenty-one million, one hundred twenty-one", and thus it is an aban number.