1321200211 has 4 divisors (see below), whose sum is σ = 1322146000. Its totient is φ = 1320254424.

The previous prime is 1321200193. The next prime is 1321200239. The reversal of 1321200211 is 1120021231.

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

It is a cyclic number.

It is not a de Polignac number, because 1321200211 - 2¹⁵ = 1321167443 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1321200191 and 1321200200.

It is not an unprimeable number, because it can be changed into a prime (1321200311) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 470796 + ... + 473593.

It is an arithmetic number, because the mean of its divisors is an integer number (330536500).

Almost surely, 2^1321200211 is an apocalyptic number.

1321200211 is a deficient number, since it is larger than the sum of its proper divisors (945789).

1321200211 is an equidigital number, since it uses as much as digits as its factorization.

1321200211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 945788.

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

The square root of 1321200211 is about 36348.3178565391. The cubic root of 1321200211 is about 1097.2936807384.

Adding to 1321200211 its reverse (1120021231), we get a palindrome (2441221442).

The spelling of 1321200211 in words is "one billion, three hundred twenty-one million, two hundred thousand, two hundred eleven".