21163135 has 8 divisors (see below), whose sum is σ = 29023776. Its totient is φ = 14511840.

The previous prime is 21163133. The next prime is 21163139. The reversal of 21163135 is 53136112.

It is a happy number.

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

It is not a de Polignac number, because 21163135 - 2¹ = 21163133 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21163133) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 302296 + ... + 302365.

It is an arithmetic number, because the mean of its divisors is an integer number (3627972).

Almost surely, 2^21163135 is an apocalyptic number.

21163135 is a deficient number, since it is larger than the sum of its proper divisors (7860641).

21163135 is an equidigital number, since it uses as much as digits as its factorization.

21163135 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 604673.

The product of its digits is 540, while the sum is 22.

The square root of 21163135 is about 4600.3407482490. The cubic root of 21163135 is about 276.6049837488.

Adding to 21163135 its reverse (53136112), we get a palindrome (74299247).

The spelling of 21163135 in words is "twenty-one million, one hundred sixty-three thousand, one hundred thirty-five".