1321423211 has 4 divisors (see below), whose sum is σ = 1321557000. Its totient is φ = 1321289424.

The previous prime is 1321423199. The next prime is 1321423223. The reversal of 1321423211 is 1123241231.

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

It is an interprime number because it is at equal distance from previous prime (1321423199) and next prime (1321423223).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1321423211 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1321423711) 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, 50786 + ... + 72263.

It is an arithmetic number, because the mean of its divisors is an integer number (330389250).

Almost surely, 2^1321423211 is an apocalyptic number.

1321423211 is a deficient number, since it is larger than the sum of its proper divisors (133789).

1321423211 is a wasteful number, since it uses less digits than its factorization.

1321423211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133788.

The product of its digits is 288, while the sum is 20.

The square root of 1321423211 is about 36351.3852693401. The cubic root of 1321423211 is about 1097.3554131751.

Adding to 1321423211 its reverse (1123241231), we get a palindrome (2444664442).

The spelling of 1321423211 in words is "one billion, three hundred twenty-one million, four hundred twenty-three thousand, two hundred eleven".