21343489 has 2 divisors, whose sum is σ = 21343490. Its totient is φ = 21343488.

The previous prime is 21343481. The next prime is 21343501. The reversal of 21343489 is 98434312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10942864 + 10400625 = 3308^2 + 3225^2 .

It is a cyclic number.

It is not a de Polignac number, because 21343489 - 2³ = 21343481 is a prime.

It is not a weakly prime, because it can be changed into another prime (21343481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10671744 + 10671745.

It is an arithmetic number, because the mean of its divisors is an integer number (10671745).

Almost surely, 2^21343489 is an apocalyptic number.

It is an amenable number.

21343489 is a deficient number, since it is larger than the sum of its proper divisors (1).

21343489 is an equidigital number, since it uses as much as digits as its factorization.

21343489 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20736, while the sum is 34.

The square root of 21343489 is about 4619.9014058744. The cubic root of 21343489 is about 277.3885124209.

The spelling of 21343489 in words is "twenty-one million, three hundred forty-three thousand, four hundred eighty-nine".