20201321 has 16 divisors (see below), whose sum is σ = 24914304. Its totient is φ = 15984384.

The previous prime is 20201303. The next prime is 20201329. The reversal of 20201321 is 12310202.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 20201321 - 2¹⁸ = 19939177 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20201329) 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, 4706 + ... + 7908.

It is an arithmetic number, because the mean of its divisors is an integer number (1557144).

Almost surely, 2^20201321 is an apocalyptic number.

It is an amenable number.

20201321 is a deficient number, since it is larger than the sum of its proper divisors (4712983).

20201321 is a wasteful number, since it uses less digits than its factorization.

20201321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3280.

The product of its (nonzero) digits is 24, while the sum is 11.

The square root of 20201321 is about 4494.5879677675. The cubic root of 20201321 is about 272.3495047577.

Adding to 20201321 its reverse (12310202), we get a palindrome (32511523).

The spelling of 20201321 in words is "twenty million, two hundred one thousand, three hundred twenty-one".