21244419 has 12 divisors (see below), whose sum is σ = 35070256. Its totient is φ = 12139632.

The previous prime is 21244417. The next prime is 21244459. The reversal of 21244419 is 91444212.

It is a happy number.

21244419 is a `hidden beast` number, since 2 + 1 + 244 + 419 = 666.

It is not a de Polignac number, because 21244419 - 2¹ = 21244417 is a prime.

It is a super-2 number, since 2×21244419² = 902650677295122, 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 = 21244392 and 21244401.

It is not an unprimeable number, because it can be changed into a prime (21244417) 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, 168544 + ... + 168669.

Almost surely, 2^21244419 is an apocalyptic number.

21244419 is a deficient number, since it is larger than the sum of its proper divisors (13825837).

21244419 is a wasteful number, since it uses less digits than its factorization.

21244419 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 337226 (or 337223 counting only the distinct ones).

The product of its digits is 2304, while the sum is 27.

The square root of 21244419 is about 4609.1668444525. The cubic root of 21244419 is about 276.9586622183.

It can be divided in two parts, 2 and 1244419, that added together give a palindrome (1244421).

The spelling of 21244419 in words is "twenty-one million, two hundred forty-four thousand, four hundred nineteen".