21436312 has 16 divisors (see below), whose sum is σ = 40406400. Its totient is φ = 10661280.

The previous prime is 21436301. The next prime is 21436319. The reversal of 21436312 is 21363412.

It is a super-2 number, since 2×21436312² = 919030944322688, which contains 22 as substring.

It is a plaindrome in base 11.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21436319) 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, 5487 + ... + 8542.

It is an arithmetic number, because the mean of its divisors is an integer number (2525400).

Almost surely, 2^21436312 is an apocalyptic number.

It is an amenable number.

21436312 is a deficient number, since it is larger than the sum of its proper divisors (18970088).

21436312 is a wasteful number, since it uses less digits than its factorization.

21436312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14226 (or 14222 counting only the distinct ones).

The product of its digits is 864, while the sum is 22.

The square root of 21436312 is about 4629.9365006445. The cubic root of 21436312 is about 277.7900524828.

Adding to 21436312 its reverse (21363412), we get a palindrome (42799724).

Subtracting from 21436312 its reverse (21363412), we obtain a square (72900 = 270²).

The spelling of 21436312 in words is "twenty-one million, four hundred thirty-six thousand, three hundred twelve".