21036895 has 32 divisors (see below), whose sum is σ = 29756160. Its totient is φ = 14112000.

The previous prime is 21036889. The next prime is 21036913. The reversal of 21036895 is 59863012.

It is not a de Polignac number, because 21036895 - 2⁷ = 21036767 is a prime.

It is a zygodrome in base 4.

It is a self number, because there is not a number n which added to its sum of digits gives 21036895.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 42600 + ... + 43090.

It is an arithmetic number, because the mean of its divisors is an integer number (929880).

Almost surely, 2^21036895 is an apocalyptic number.

21036895 is a deficient number, since it is larger than the sum of its proper divisors (8719265).

21036895 is a wasteful number, since it uses less digits than its factorization.

21036895 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 567.

The product of its (nonzero) digits is 12960, while the sum is 34.

The square root of 21036895 is about 4586.5995028997. The cubic root of 21036895 is about 276.0538953421.

It can be divided in two parts, 2103 and 6895, that added together give a palindrome (8998).

The spelling of 21036895 in words is "twenty-one million, thirty-six thousand, eight hundred ninety-five".