321138873 has 24 divisors (see below), whose sum is σ = 519719616. Its totient is φ = 189367200.

The previous prime is 321138863. The next prime is 321138901. The reversal of 321138873 is 378831123.

It is not a de Polignac number, because 321138873 - 2⁶ = 321138809 is a prime.

It is not an unprimeable number, because it can be changed into a prime (321138833) 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, 40173 + ... + 47498.

It is an arithmetic number, because the mean of its divisors is an integer number (21654984).

Almost surely, 2^321138873 is an apocalyptic number.

321138873 is a gapful number since it is divisible by the number (33) formed by its first and last digit.

It is an amenable number.

321138873 is a deficient number, since it is larger than the sum of its proper divisors (198580743).

321138873 is a wasteful number, since it uses less digits than its factorization.

321138873 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87725 (or 87722 counting only the distinct ones).

The product of its digits is 24192, while the sum is 36.

The square root of 321138873 is about 17920.3480155939. The cubic root of 321138873 is about 684.8008535408.

Adding to 321138873 its reverse (378831123), we get a palindrome (699969996).

The spelling of 321138873 in words is "three hundred twenty-one million, one hundred thirty-eight thousand, eight hundred seventy-three".