22221641 has 6 divisors (see below), whose sum is σ = 24062670. Its totient is φ = 20512128.

The previous prime is 22221599. The next prime is 22221649. The reversal of 22221641 is 14612222.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 1254400 + 20967241 = 1120^2 + 4579^2 .

It is not a de Polignac number, because 22221641 - 2¹⁴ = 22205257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22221649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 65576 + ... + 65913.

It is an arithmetic number, because the mean of its divisors is an integer number (4010445).

Almost surely, 2^22221641 is an apocalyptic number.

It is an amenable number.

22221641 is a deficient number, since it is larger than the sum of its proper divisors (1841029).

22221641 is a wasteful number, since it uses less digits than its factorization.

22221641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131515 (or 131502 counting only the distinct ones).

The product of its digits is 384, while the sum is 20.

The square root of 22221641 is about 4713.9835595810. The cubic root of 22221641 is about 281.1417706368.

Adding to 22221641 its reverse (14612222), we get a palindrome (36833863).

The spelling of 22221641 in words is "twenty-two million, two hundred twenty-one thousand, six hundred forty-one".