21437049 has 8 divisors (see below), whose sum is σ = 28624960. Its totient is φ = 14270256.

The previous prime is 21437041. The next prime is 21437063. The reversal of 21437049 is 94073412.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21437049 - 2³ = 21437041 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21437041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2734 + ... + 7095.

It is an arithmetic number, because the mean of its divisors is an integer number (3578120).

Almost surely, 2^21437049 is an apocalyptic number.

It is an amenable number.

21437049 is a deficient number, since it is larger than the sum of its proper divisors (7187911).

21437049 is an equidigital number, since it uses as much as digits as its factorization.

21437049 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10559.

The product of its (nonzero) digits is 6048, while the sum is 30.

The square root of 21437049 is about 4630.0160906848. The cubic root of 21437049 is about 277.7932360049.

The spelling of 21437049 in words is "twenty-one million, four hundred thirty-seven thousand, forty-nine".