21122884 has 12 divisors (see below), whose sum is σ = 37001664. Its totient is φ = 10550984.

The previous prime is 21122869. The next prime is 21122887. The reversal of 21122884 is 48822112.

It is not an unprimeable number, because it can be changed into a prime (21122887) 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, 3537 + ... + 7399.

It is an arithmetic number, because the mean of its divisors is an integer number (3083472).

Almost surely, 2^21122884 is an apocalyptic number.

It is an amenable number.

21122884 is a deficient number, since it is larger than the sum of its proper divisors (15878780).

21122884 is a wasteful number, since it uses less digits than its factorization.

21122884 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5234 (or 5232 counting only the distinct ones).

The product of its digits is 2048, while the sum is 28.

The square root of 21122884 is about 4595.9638814943. The cubic root of 21122884 is about 276.4295104842.

Adding to 21122884 its reverse (48822112), we get a palindrome (69944996).

The spelling of 21122884 in words is "twenty-one million, one hundred twenty-two thousand, eight hundred eighty-four".