21036267 has 48 divisors (see below), whose sum is σ = 36691200. Its totient is φ = 11796192.

The previous prime is 21036241. The next prime is 21036269. The reversal of 21036267 is 76263012.

It is a happy number.

It is not a de Polignac number, because 21036267 - 2⁶ = 21036203 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a self number, because there is not a number n which added to its sum of digits gives 21036267.

It is not an unprimeable number, because it can be changed into a prime (21036269) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 141109 + ... + 141257.

It is an arithmetic number, because the mean of its divisors is an integer number (764400).

Almost surely, 2^21036267 is an apocalyptic number.

21036267 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

21036267 is a deficient number, since it is larger than the sum of its proper divisors (15654933).

21036267 is an equidigital number, since it uses as much as digits as its factorization.

21036267 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 254 (or 242 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 27.

The square root of 21036267 is about 4586.5310420840. The cubic root of 21036267 is about 276.0511483656.

Adding to 21036267 its reverse (76263012), we get a palindrome (97299279).

The spelling of 21036267 in words is "twenty-one million, thirty-six thousand, two hundred sixty-seven".