21265105 has 8 divisors (see below), whose sum is σ = 25546752. Its totient is φ = 16993008.

The previous prime is 21265093. The next prime is 21265129. The reversal of 21265105 is 50156212.

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

It is a cyclic number.

It is not a de Polignac number, because 21265105 - 2¹¹ = 21263057 is a prime.

It is a super-2 number, since 2×21265105² = 904409381322050, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4144 + ... + 7726.

It is an arithmetic number, because the mean of its divisors is an integer number (3193344).

Almost surely, 2^21265105 is an apocalyptic number.

It is an amenable number.

21265105 is a deficient number, since it is larger than the sum of its proper divisors (4281647).

21265105 is a wasteful number, since it uses less digits than its factorization.

21265105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4775.

The product of its (nonzero) digits is 600, while the sum is 22.

The square root of 21265105 is about 4611.4103048850. The cubic root of 21265105 is about 277.0485259510.

The spelling of 21265105 in words is "twenty-one million, two hundred sixty-five thousand, one hundred five".