21313336 has 16 divisors (see below), whose sum is σ = 43595640. Its totient is φ = 9687840.

The previous prime is 21313333. The next prime is 21313343. The reversal of 21313336 is 63331312.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21313333) 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, 121011 + ... + 121186.

Almost surely, 2^21313336 is an apocalyptic number.

It is an amenable number.

21313336 is an abundant number, since it is smaller than the sum of its proper divisors (22282304).

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

21313336 is a wasteful number, since it uses less digits than its factorization.

21313336 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 242214 (or 242210 counting only the distinct ones).

The product of its digits is 972, while the sum is 22.

The square root of 21313336 is about 4616.6368711433. The cubic root of 21313336 is about 277.2578240457.

Adding to 21313336 its reverse (63331312), we get a palindrome (84644648).

The spelling of 21313336 in words is "twenty-one million, three hundred thirteen thousand, three hundred thirty-six".