21135627 has 16 divisors (see below), whose sum is σ = 31387680. Its totient is φ = 14056416.

The previous prime is 21135613. The next prime is 21135637. The reversal of 21135627 is 72653112.

It is a happy number.

21135627 is a `hidden beast` number, since 2 + 1 + 1 + 35 + 627 = 666.

It is not a de Polignac number, because 21135627 - 2⁸ = 21135371 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 21135627.

It is not an unprimeable number, because it can be changed into a prime (21135637) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15913 + ... + 17189.

It is an arithmetic number, because the mean of its divisors is an integer number (1961730).

Almost surely, 2^21135627 is an apocalyptic number.

21135627 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

21135627 is a deficient number, since it is larger than the sum of its proper divisors (10252053).

21135627 is a wasteful number, since it uses less digits than its factorization.

21135627 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1899 (or 1893 counting only the distinct ones).

The product of its digits is 2520, while the sum is 27.

The square root of 21135627 is about 4597.3499975529. The cubic root of 21135627 is about 276.4850873826.

Adding to 21135627 its reverse (72653112), we get a palindrome (93788739).

The spelling of 21135627 in words is "twenty-one million, one hundred thirty-five thousand, six hundred twenty-seven".