21449417 has 4 divisors (see below), whose sum is σ = 23399376. Its totient is φ = 19499460.

The previous prime is 21449413. The next prime is 21449431. The reversal of 21449417 is 71494412.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21449417 - 2² = 21449413 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21449413) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 974963 + ... + 974984.

It is an arithmetic number, because the mean of its divisors is an integer number (5849844).

Almost surely, 2^21449417 is an apocalyptic number.

It is an amenable number.

21449417 is a deficient number, since it is larger than the sum of its proper divisors (1949959).

21449417 is a wasteful number, since it uses less digits than its factorization.

21449417 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1949958.

The product of its digits is 8064, while the sum is 32.

The square root of 21449417 is about 4631.3515306010. The cubic root of 21449417 is about 277.8466495478.

The spelling of 21449417 in words is "twenty-one million, four hundred forty-nine thousand, four hundred seventeen".