1321121201 has 4 divisors (see below), whose sum is σ = 1321409904. Its totient is φ = 1320832500.

The previous prime is 1321121161. The next prime is 1321121213. The reversal of 1321121201 is 1021211231.

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 1321121201 - 2¹⁴ = 1321104817 is a prime.

It is a super-2 number, since 2×1321121201² = 3490722455463364802, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1321121231) 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 3 ways as a sum of consecutive naturals, for example, 137375 + ... + 146676.

It is an arithmetic number, because the mean of its divisors is an integer number (330352476).

Almost surely, 2^1321121201 is an apocalyptic number.

It is an amenable number.

1321121201 is a deficient number, since it is larger than the sum of its proper divisors (288703).

1321121201 is an equidigital number, since it uses as much as digits as its factorization.

1321121201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 288702.

The product of its (nonzero) digits is 24, while the sum is 14.

The square root of 1321121201 is about 36347.2309949465. The cubic root of 1321121201 is about 1097.2718069651.

Adding to 1321121201 its reverse (1021211231), we get a palindrome (2342332432).

The spelling of 1321121201 in words is "one billion, three hundred twenty-one million, one hundred twenty-one thousand, two hundred one".