21415036 has 12 divisors (see below), whose sum is σ = 39680928. Its totient is φ = 10077632.

The previous prime is 21415027. The next prime is 21415067. The reversal of 21415036 is 63051412.

It is a junction number, because it is equal to n+sod(n) for n = 21414998 and 21415016.

It is a congruent number.

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, 157396 + ... + 157531.

It is an arithmetic number, because the mean of its divisors is an integer number (3306744).

Almost surely, 2^21415036 is an apocalyptic number.

It is an amenable number.

21415036 is a deficient number, since it is larger than the sum of its proper divisors (18265892).

21415036 is a wasteful number, since it uses less digits than its factorization.

21415036 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 314948 (or 314946 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 21415036 is about 4627.6382745413. The cubic root of 21415036 is about 277.6981178628.

Adding to 21415036 its reverse (63051412), we get a palindrome (84466448).

The spelling of 21415036 in words is "twenty-one million, four hundred fifteen thousand, thirty-six".