20011321 has 8 divisors (see below), whose sum is σ = 22363488. Its totient is φ = 17748000.

The previous prime is 20011319. The next prime is 20011349. The reversal of 20011321 is 12311002.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20011321 - 2¹ = 20011319 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20011298 and 20011307.

It is not an unprimeable number, because it can be changed into a prime (20011301) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21735 + ... + 22636.

It is an arithmetic number, because the mean of its divisors is an integer number (2795436).

Almost surely, 2^20011321 is an apocalyptic number.

It is an amenable number.

20011321 is a deficient number, since it is larger than the sum of its proper divisors (2352167).

20011321 is a wasteful number, since it uses less digits than its factorization.

20011321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44423.

The product of its (nonzero) digits is 12, while the sum is 10.

The square root of 20011321 is about 4473.4015022128. The cubic root of 20011321 is about 271.4929685352.

Adding to 20011321 its reverse (12311002), we get a palindrome (32322323).

The spelling of 20011321 in words is "twenty million, eleven thousand, three hundred twenty-one".