21444122 has 24 divisors (see below), whose sum is σ = 38807136. Its totient is φ = 8704584.

The previous prime is 21444121. The next prime is 21444131. The reversal of 21444122 is 22144412.

It is a junction number, because it is equal to n+sod(n) for n = 21444094 and 21444103.

It is not an unprimeable number, because it can be changed into a prime (21444121) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2933 + ... + 7175.

It is an arithmetic number, because the mean of its divisors is an integer number (1616964).

Almost surely, 2^21444122 is an apocalyptic number.

21444122 is a deficient number, since it is larger than the sum of its proper divisors (17363014).

21444122 is a wasteful number, since it uses less digits than its factorization.

21444122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4290 (or 4271 counting only the distinct ones).

The product of its digits is 512, while the sum is 20.

The square root of 21444122 is about 4630.7798479306. The cubic root of 21444122 is about 277.8237846049.

Adding to 21444122 its reverse (22144412), we get a palindrome (43588534).

It can be divided in two parts, 2144412 and 2, that multiplied together give a palindrome (4288824).

The spelling of 21444122 in words is "twenty-one million, four hundred forty-four thousand, one hundred twenty-two".