20132321 has 4 divisors (see below), whose sum is σ = 21962544. Its totient is φ = 18302100.

The previous prime is 20132311. The next prime is 20132341. The reversal of 20132321 is 12323102.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20132321 - 2¹⁰ = 20131297 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20132296 and 20132305.

It is not an unprimeable number, because it can be changed into a prime (20132311) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 915095 + ... + 915116.

It is an arithmetic number, because the mean of its divisors is an integer number (5490636).

Almost surely, 2^20132321 is an apocalyptic number.

It is an amenable number.

20132321 is a deficient number, since it is larger than the sum of its proper divisors (1830223).

20132321 is a wasteful number, since it uses less digits than its factorization.

20132321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1830222.

The product of its (nonzero) digits is 72, while the sum is 14.

The square root of 20132321 is about 4486.9055037966. The cubic root of 20132321 is about 272.0390704040.

Adding to 20132321 its reverse (12323102), we get a palindrome (32455423).

It can be divided in two parts, 2013 and 2321, that added together give a palindrome (4334).

The spelling of 20132321 in words is "twenty million, one hundred thirty-two thousand, three hundred twenty-one".