21214849 has 4 divisors (see below), whose sum is σ = 22331440. Its totient is φ = 20098260.

The previous prime is 21214847. The next prime is 21214859. The reversal of 21214849 is 94841212.

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 21214849 - 2¹ = 21214847 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21214849.

It is not an unprimeable number, because it can be changed into a prime (21214847) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 558267 + ... + 558304.

It is an arithmetic number, because the mean of its divisors is an integer number (5582860).

Almost surely, 2^21214849 is an apocalyptic number.

It is an amenable number.

21214849 is a deficient number, since it is larger than the sum of its proper divisors (1116591).

21214849 is a wasteful number, since it uses less digits than its factorization.

21214849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1116590.

The product of its digits is 4608, while the sum is 31.

The square root of 21214849 is about 4605.9579893872. The cubic root of 21214849 is about 276.8301034299.

The spelling of 21214849 in words is "twenty-one million, two hundred fourteen thousand, eight hundred forty-nine".