20341221 has 4 divisors (see below), whose sum is σ = 27121632. Its totient is φ = 13560812.

The previous prime is 20341213. The next prime is 20341247. The reversal of 20341221 is 12214302.

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 20341221 - 2³ = 20341213 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20341221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20341201) 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 3 ways as a sum of consecutive naturals, for example, 3390201 + ... + 3390206.

It is an arithmetic number, because the mean of its divisors is an integer number (6780408).

Almost surely, 2^20341221 is an apocalyptic number.

It is an amenable number.

20341221 is a deficient number, since it is larger than the sum of its proper divisors (6780411).

20341221 is an equidigital number, since it uses as much as digits as its factorization.

20341221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6780410.

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 20341221 is about 4510.1242776669. The cubic root of 20341221 is about 272.9767587455.

Adding to 20341221 its reverse (12214302), we get a palindrome (32555523).

The spelling of 20341221 in words is "twenty million, three hundred forty-one thousand, two hundred twenty-one".