20242221 has 4 divisors (see below), whose sum is σ = 26989632. Its totient is φ = 13494812.

The previous prime is 20242213. The next prime is 20242247. The reversal of 20242221 is 12224202.

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 20242221 - 2³ = 20242213 is a prime.

It is a super-2 number, since 2×20242221² = 819495022025682, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20242221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20242021) 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, 3373701 + ... + 3373706.

It is an arithmetic number, because the mean of its divisors is an integer number (6747408).

Almost surely, 2^20242221 is an apocalyptic number.

It is an amenable number.

20242221 is a deficient number, since it is larger than the sum of its proper divisors (6747411).

20242221 is an equidigital number, since it uses as much as digits as its factorization.

20242221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6747410.

The product of its (nonzero) digits is 128, while the sum is 15.

The square root of 20242221 is about 4499.1355836427. The cubic root of 20242221 is about 272.5331822791.

Adding to 20242221 its reverse (12224202), we get a palindrome (32466423).

The spelling of 20242221 in words is "twenty million, two hundred forty-two thousand, two hundred twenty-one".