21775085 has 16 divisors (see below), whose sum is σ = 27181440. Its totient is φ = 16726080.

The previous prime is 21775069. The next prime is 21775093. The reversal of 21775085 is 58057712.

It is not a de Polignac number, because 21775085 - 2⁴ = 21775069 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 37850 + ... + 38420.

It is an arithmetic number, because the mean of its divisors is an integer number (1698840).

Almost surely, 2^21775085 is an apocalyptic number.

It is an amenable number.

21775085 is a deficient number, since it is larger than the sum of its proper divisors (5406355).

21775085 is a wasteful number, since it uses less digits than its factorization.

21775085 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 868.

The product of its (nonzero) digits is 19600, while the sum is 35.

The square root of 21775085 is about 4666.3781458429. The cubic root of 21775085 is about 279.2457806022.

The spelling of 21775085 in words is "twenty-one million, seven hundred seventy-five thousand, eighty-five".