1321431213 has 8 divisors (see below), whose sum is σ = 1838513088. Its totient is φ = 842651744.

The previous prime is 1321431211. The next prime is 1321431277. The reversal of 1321431213 is 3121341231.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1321431213 - 2¹ = 1321431211 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1321431213.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1321431211) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9575520 + ... + 9575657.

It is an arithmetic number, because the mean of its divisors is an integer number (229814136).

Almost surely, 2^1321431213 is an apocalyptic number.

It is an amenable number.

1321431213 is a deficient number, since it is larger than the sum of its proper divisors (517081875).

1321431213 is a wasteful number, since it uses less digits than its factorization.

1321431213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19151203.

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

The square root of 1321431213 is about 36351.4953337548. The cubic root of 1321431213 is about 1097.3576282162.

Adding to 1321431213 its reverse (3121341231), we get a palindrome (4442772444).

The spelling of 1321431213 in words is "one billion, three hundred twenty-one million, four hundred thirty-one thousand, two hundred thirteen".