1321211243 has 8 divisors (see below), whose sum is σ = 1443296496. Its totient is φ = 1199455200.

The previous prime is 1321211237. The next prime is 1321211251. The reversal of 1321211243 is 3421121231.

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 1321211243 - 2³⁰ = 247469419 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1321211293) 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, 73868 + ... + 89993.

It is an arithmetic number, because the mean of its divisors is an integer number (180412062).

Almost surely, 2^1321211243 is an apocalyptic number.

1321211243 is a deficient number, since it is larger than the sum of its proper divisors (122085253).

1321211243 is a wasteful number, since it uses less digits than its factorization.

1321211243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 164605.

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

The square root of 1321211243 is about 36348.4696101500. The cubic root of 1321211243 is about 1097.2967348580.

Adding to 1321211243 its reverse (3421121231), we get a palindrome (4742332474).

The spelling of 1321211243 in words is "one billion, three hundred twenty-one million, two hundred eleven thousand, two hundred forty-three".