21343441 has 16 divisors (see below), whose sum is σ = 25804800. Its totient is φ = 17245008.

The previous prime is 21343429. The next prime is 21343451. The reversal of 21343441 is 14434312.

It is a de Polignac number, because none of the positive numbers 2^k-21343441 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21343451) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 50730 + ... + 51148.

It is an arithmetic number, because the mean of its divisors is an integer number (1612800).

Almost surely, 2^21343441 is an apocalyptic number.

It is an amenable number.

21343441 is a deficient number, since it is larger than the sum of its proper divisors (4461359).

21343441 is a wasteful number, since it uses less digits than its factorization.

21343441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 828.

The product of its digits is 1152, while the sum is 22.

The square root of 21343441 is about 4619.8962109554. The cubic root of 21343441 is about 277.3883044784.

Adding to 21343441 its reverse (14434312), we get a palindrome (35777753).

The spelling of 21343441 in words is "twenty-one million, three hundred forty-three thousand, four hundred forty-one".