1321143873 has 16 divisors (see below), whose sum is σ = 2031989760. Its totient is φ = 747882576.

The previous prime is 1321143841. The next prime is 1321143883. The reversal of 1321143873 is 3783411231.

It is not a de Polignac number, because 1321143873 - 2⁵ = 1321143841 is a prime.

It is a super-2 number, since 2×1321143873² = 3490842266330880258, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1321143883) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 291733 + ... + 296226.

It is an arithmetic number, because the mean of its divisors is an integer number (126999360).

Almost surely, 2^1321143873 is an apocalyptic number.

It is an amenable number.

1321143873 is a deficient number, since it is larger than the sum of its proper divisors (710845887).

1321143873 is a wasteful number, since it uses less digits than its factorization.

1321143873 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 588076.

The product of its digits is 12096, while the sum is 33.

The square root of 1321143873 is about 36347.5428743127. The cubic root of 1321143873 is about 1097.2780837558.

The spelling of 1321143873 in words is "one billion, three hundred twenty-one million, one hundred forty-three thousand, eight hundred seventy-three".