21036315 has 8 divisors (see below), whose sum is σ = 33658128. Its totient is φ = 11219360.

The previous prime is 21036311. The next prime is 21036341. The reversal of 21036315 is 51363012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21036315 - 2² = 21036311 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21036291 and 21036300.

It is not an unprimeable number, because it can be changed into a prime (21036311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 701196 + ... + 701225.

It is an arithmetic number, because the mean of its divisors is an integer number (4207266).

Almost surely, 2^21036315 is an apocalyptic number.

21036315 is a deficient number, since it is larger than the sum of its proper divisors (12621813).

21036315 is a wasteful number, since it uses less digits than its factorization.

21036315 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1402429.

The product of its (nonzero) digits is 540, while the sum is 21.

The square root of 21036315 is about 4586.5362747939. The cubic root of 21036315 is about 276.0513583275.

Adding to 21036315 its reverse (51363012), we get a palindrome (72399327).

The spelling of 21036315 in words is "twenty-one million, thirty-six thousand, three hundred fifteen".