20211321 has 8 divisors (see below), whose sum is σ = 29021440. Its totient is φ = 12437712.

The previous prime is 20211263. The next prime is 20211377. The reversal of 20211321 is 12311202.

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

It is not a de Polignac number, because 20211321 - 2¹³ = 20203129 is a prime.

It is a Duffinian number.

It is a plaindrome in base 16.

It is a junction number, because it is equal to n+sod(n) for n = 20211297 and 20211306.

It is not an unprimeable number, because it can be changed into a prime (20211221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 259081 + ... + 259158.

It is an arithmetic number, because the mean of its divisors is an integer number (3627680).

Almost surely, 2^20211321 is an apocalyptic number.

It is an amenable number.

20211321 is a deficient number, since it is larger than the sum of its proper divisors (8810119).

20211321 is a wasteful number, since it uses less digits than its factorization.

20211321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 518255.

The product of its (nonzero) digits is 24, while the sum is 12.

The square root of 20211321 is about 4495.7002791556. The cubic root of 20211321 is about 272.3944365682.

Adding to 20211321 its reverse (12311202), we get a palindrome (32522523).

The spelling of 20211321 in words is "twenty million, two hundred eleven thousand, three hundred twenty-one".