22050021 has 16 divisors (see below), whose sum is σ = 34684928. Its totient is φ = 12193200.

The previous prime is 22050019. The next prime is 22050043. The reversal of 22050021 is 12005022.

It is not a de Polignac number, because 22050021 - 2¹ = 22050019 is a prime.

It is a super-2 number, since 2×22050021² = 972406852200882, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 22049979 and 22050006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22050001) 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, 16285 + ... + 17586.

It is an arithmetic number, because the mean of its divisors is an integer number (2167808).

Almost surely, 2^22050021 is an apocalyptic number.

22050021 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

22050021 is a deficient number, since it is larger than the sum of its proper divisors (12634907).

22050021 is a wasteful number, since it uses less digits than its factorization.

22050021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33912.

The product of its (nonzero) digits is 40, while the sum is 12.

The square root of 22050021 is about 4695.7449888170. The cubic root of 22050021 is about 280.4161371812.

Adding to 22050021 its reverse (12005022), we get a palindrome (34055043).

The spelling of 22050021 in words is "twenty-two million, fifty thousand, twenty-one".