21435316 has 24 divisors (see below), whose sum is σ = 43070720. Its totient is φ = 9143712.

The previous prime is 21435313. The next prime is 21435319. The reversal of 21435316 is 61353412.

It is an interprime number because it is at equal distance from previous prime (21435313) and next prime (21435319).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21435311) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4741 + ... + 8083.

Almost surely, 2^21435316 is an apocalyptic number.

It is an amenable number.

21435316 is an abundant number, since it is smaller than the sum of its proper divisors (21635404).

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

21435316 is a wasteful number, since it uses less digits than its factorization.

21435316 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3583 (or 3581 counting only the distinct ones).

The product of its digits is 2160, while the sum is 25.

The square root of 21435316 is about 4629.8289385246. The cubic root of 21435316 is about 277.7857500764.

Adding to 21435316 its reverse (61353412), we get a palindrome (82788728).

It can be divided in two parts, 214353 and 16, that added together give a square (214369 = 463²).

The spelling of 21435316 in words is "twenty-one million, four hundred thirty-five thousand, three hundred sixteen".