321133421 has 16 divisors (see below), whose sum is σ = 386870400. Its totient is φ = 260402688.

The previous prime is 321133409. The next prime is 321133427. The reversal of 321133421 is 124331123.

It is not a de Polignac number, because 321133421 - 2⁶ = 321133357 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 321133393 and 321133402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (321133427) 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, 133001 + ... + 135393.

It is an arithmetic number, because the mean of its divisors is an integer number (24179400).

Almost surely, 2^321133421 is an apocalyptic number.

It is an amenable number.

321133421 is a deficient number, since it is larger than the sum of its proper divisors (65736979).

321133421 is a wasteful number, since it uses less digits than its factorization.

321133421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3428.

The product of its digits is 432, while the sum is 20.

The square root of 321133421 is about 17920.1958973667. The cubic root of 321133421 is about 684.7969782128.

Adding to 321133421 its reverse (124331123), we get a palindrome (445464544).

The spelling of 321133421 in words is "three hundred twenty-one million, one hundred thirty-three thousand, four hundred twenty-one".