1321211433 has 4 divisors (see below), whose sum is σ = 1761615248. Its totient is φ = 880807620.

The previous prime is 1321211431. The next prime is 1321211443. The reversal of 1321211433 is 3341121231.

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 not a de Polignac number, because 1321211433 - 2¹ = 1321211431 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1321211431) 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, 220201903 + ... + 220201908.

It is an arithmetic number, because the mean of its divisors is an integer number (440403812).

Almost surely, 2^1321211433 is an apocalyptic number.

It is an amenable number.

1321211433 is a deficient number, since it is larger than the sum of its proper divisors (440403815).

1321211433 is an equidigital number, since it uses as much as digits as its factorization.

1321211433 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 440403814.

The product of its digits is 432, while the sum is 21.

The square root of 1321211433 is about 36348.4722237400. The cubic root of 1321211433 is about 1097.2967874578.

Adding to 1321211433 its reverse (3341121231), we get a palindrome (4662332664).

The spelling of 1321211433 in words is "one billion, three hundred twenty-one million, two hundred eleven thousand, four hundred thirty-three".