1321120209 has 16 divisors (see below), whose sum is σ = 1774816704. Its totient is φ = 874104000.

The previous prime is 1321120193. The next prime is 1321120219. The reversal of 1321120209 is 9020211231.

It is not a de Polignac number, because 1321120209 - 2⁴ = 1321120193 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1321120219) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 341134 + ... + 344984.

It is an arithmetic number, because the mean of its divisors is an integer number (110926044).

Almost surely, 2^1321120209 is an apocalyptic number.

It is an amenable number.

1321120209 is a deficient number, since it is larger than the sum of its proper divisors (453696495).

1321120209 is a wasteful number, since it uses less digits than its factorization.

1321120209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4688.

The product of its (nonzero) digits is 216, while the sum is 21.

The square root of 1321120209 is about 36347.2173487875. The cubic root of 1321120209 is about 1097.2715323261.

The spelling of 1321120209 in words is "one billion, three hundred twenty-one million, one hundred twenty thousand, two hundred nine".