21677135 has 4 divisors (see below), whose sum is σ = 26012568. Its totient is φ = 17341704.

The previous prime is 21677093. The next prime is 21677137. The reversal of 21677135 is 53177612.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21677135 - 2¹⁰ = 21676111 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 (21677137) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2167709 + ... + 2167718.

It is an arithmetic number, because the mean of its divisors is an integer number (6503142).

Almost surely, 2^21677135 is an apocalyptic number.

21677135 is a deficient number, since it is larger than the sum of its proper divisors (4335433).

21677135 is an equidigital number, since it uses as much as digits as its factorization.

21677135 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4335432.

The product of its digits is 8820, while the sum is 32.

The square root of 21677135 is about 4655.8710248459. The cubic root of 21677135 is about 278.8264444766.

It can be divided in two parts, 21677 and 135, that added together give a palindrome (21812).

The spelling of 21677135 in words is "twenty-one million, six hundred seventy-seven thousand, one hundred thirty-five".