20042221 has 8 divisors (see below), whose sum is σ = 20633600. Its totient is φ = 19459440.

The previous prime is 20042173. The next prime is 20042249. The reversal of 20042221 is 12224002.

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 20042221 - 2⁹ = 20041709 is a prime.

It is a super-2 number, since 2×20042221² = 803381245225682, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20042261) 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, 2740 + ... + 6898.

It is an arithmetic number, because the mean of its divisors is an integer number (2579200).

Almost surely, 2^20042221 is an apocalyptic number.

It is an amenable number.

20042221 is a deficient number, since it is larger than the sum of its proper divisors (591379).

20042221 is an equidigital number, since it uses as much as digits as its factorization.

20042221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4299.

The product of its (nonzero) digits is 64, while the sum is 13.

The square root of 20042221 is about 4476.8539176524. The cubic root of 20042221 is about 271.6326364507.

Adding to 20042221 its reverse (12224002), we get a palindrome (32266223).

It can be divided in two parts, 2004 and 2221, that added together give a square (4225 = 65²).

The spelling of 20042221 in words is "twenty million, forty-two thousand, two hundred twenty-one".