21775135 has 8 divisors (see below), whose sum is σ = 27266400. Its totient is φ = 16662624.

The previous prime is 21775123. The next prime is 21775139. The reversal of 21775135 is 53157712.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21775135 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21775097 and 21775106.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21775139) 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, 94560 + ... + 94789.

It is an arithmetic number, because the mean of its divisors is an integer number (3408300).

Almost surely, 2^21775135 is an apocalyptic number.

21775135 is a deficient number, since it is larger than the sum of its proper divisors (5491265).

21775135 is a wasteful number, since it uses less digits than its factorization.

21775135 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 189377.

The product of its digits is 7350, while the sum is 31.

The square root of 21775135 is about 4666.3835033139. The cubic root of 21775135 is about 279.2459943370.

The spelling of 21775135 in words is "twenty-one million, seven hundred seventy-five thousand, one hundred thirty-five".