21422344 has 8 divisors (see below), whose sum is σ = 40166910. Its totient is φ = 10711168.

The previous prime is 21422341. The next prime is 21422347. The reversal of 21422344 is 44322412.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21422341) and next prime (21422347).

It can be written as a sum of positive squares in only one way, i.e., 19909444 + 1512900 = 4462^2 + 1230^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (21422341) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1338889 + ... + 1338904.

Almost surely, 2^21422344 is an apocalyptic number.

It is an amenable number.

21422344 is a deficient number, since it is larger than the sum of its proper divisors (18744566).

21422344 is a wasteful number, since it uses less digits than its factorization.

21422344 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2677799 (or 2677795 counting only the distinct ones).

The product of its digits is 1536, while the sum is 22.

The square root of 21422344 is about 4628.4278108230. The cubic root of 21422344 is about 277.7297029454.

Adding to 21422344 its reverse (44322412), we get a palindrome (65744756).

The spelling of 21422344 in words is "twenty-one million, four hundred twenty-two thousand, three hundred forty-four".