21214446 has 24 divisors (see below), whose sum is σ = 46638312. Its totient is φ = 6428400.

The previous prime is 21214433. The next prime is 21214451. The reversal of 21214446 is 64441212.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13885 + ... + 15336.

It is an arithmetic number, because the mean of its divisors is an integer number (1943263).

Almost surely, 2^21214446 is an apocalyptic number.

21214446 is an abundant number, since it is smaller than the sum of its proper divisors (25423866).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21214446 is a wasteful number, since it uses less digits than its factorization.

21214446 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29248 (or 29237 counting only the distinct ones).

The product of its digits is 1536, while the sum is 24.

The square root of 21214446 is about 4605.9142414943. The cubic root of 21214446 is about 276.8283505187.

Adding to 21214446 its reverse (64441212), we get a palindrome (85655658).

The spelling of 21214446 in words is "twenty-one million, two hundred fourteen thousand, four hundred forty-six".