21343444 has 12 divisors (see below), whose sum is σ = 37460500. Its totient is φ = 10640448.

The previous prime is 21343429. The next prime is 21343451. The reversal of 21343444 is 44434312.

It can be written as a sum of positive squares in 2 ways, for example, as 14531344 + 6812100 = 3812^2 + 2610^2 .

It is a super-2 number, since 2×21343444² = 911085203562272, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6249 + ... + 9040.

Almost surely, 2^21343444 is an apocalyptic number.

It is an amenable number.

21343444 is a deficient number, since it is larger than the sum of its proper divisors (16117056).

21343444 is a wasteful number, since it uses less digits than its factorization.

21343444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15642 (or 15640 counting only the distinct ones).

The product of its digits is 4608, while the sum is 25.

The square root of 21343444 is about 4619.8965356380. The cubic root of 21343444 is about 277.3883174748.

Adding to 21343444 its reverse (44434312), we get a palindrome (65777756).

The spelling of 21343444 in words is "twenty-one million, three hundred forty-three thousand, four hundred forty-four".