21341284 has 12 divisors (see below), whose sum is σ = 37425024. Its totient is φ = 10648424.

The previous prime is 21341249. The next prime is 21341317. The reversal of 21341284 is 48214312.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3292 + ... + 7315.

It is an arithmetic number, because the mean of its divisors is an integer number (3118752).

Almost surely, 2^21341284 is an apocalyptic number.

It is an amenable number.

21341284 is a deficient number, since it is larger than the sum of its proper divisors (16083740).

21341284 is a wasteful number, since it uses less digits than its factorization.

21341284 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11114 (or 11112 counting only the distinct ones).

The product of its digits is 1536, while the sum is 25.

The square root of 21341284 is about 4619.6627582541. The cubic root of 21341284 is about 277.3789597382.

Adding to 21341284 its reverse (48214312), we get a palindrome (69555596).

The spelling of 21341284 in words is "twenty-one million, three hundred forty-one thousand, two hundred eighty-four".