21416036 has 36 divisors (see below), whose sum is σ = 40645500. Its totient is φ = 9860928.

The previous prime is 21416033. The next prime is 21416051. The reversal of 21416036 is 63061412.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 13542400 + 7873636 = 3680^2 + 2806^2 .

It is a Harshad number since it is a multiple of its sum of digits (23).

It is not an unprimeable number, because it can be changed into a prime (21416033) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 61190 + ... + 61538.

Almost surely, 2^21416036 is an apocalyptic number.

It is an amenable number.

21416036 is a deficient number, since it is larger than the sum of its proper divisors (19229464).

21416036 is a wasteful number, since it uses less digits than its factorization.

21416036 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 428 (or 403 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 21416036 is about 4627.7463197544. The cubic root of 21416036 is about 277.7024402744.

Adding to 21416036 its reverse (63061412), we get a palindrome (84477448).

The spelling of 21416036 in words is "twenty-one million, four hundred sixteen thousand, thirty-six".