1321200243 has 24 divisors (see below), whose sum is σ = 2083039920. Its totient is φ = 800285760.

The previous prime is 1321200239. The next prime is 1321200263. The reversal of 1321200243 is 3420021231.

It is not a de Polignac number, because 1321200243 - 2² = 1321200239 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1321200263) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 317605 + ... + 321737.

It is an arithmetic number, because the mean of its divisors is an integer number (86793330).

Almost surely, 2^1321200243 is an apocalyptic number.

1321200243 is a deficient number, since it is larger than the sum of its proper divisors (761839677).

1321200243 is a wasteful number, since it uses less digits than its factorization.

1321200243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7379 (or 7376 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 1321200243 is about 36348.3182967245. The cubic root of 1321200243 is about 1097.2936895974.

Adding to 1321200243 its reverse (3420021231), we get a palindrome (4741221474).

The spelling of 1321200243 in words is "one billion, three hundred twenty-one million, two hundred thousand, two hundred forty-three".