21126895 has 8 divisors (see below), whose sum is σ = 25416720. Its totient is φ = 16858560.

The previous prime is 21126893. The next prime is 21126899. The reversal of 21126895 is 59862112.

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

It is not a de Polignac number, because 21126895 - 2¹ = 21126893 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21126895.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21126893) 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, 3121 + ... + 7210.

It is an arithmetic number, because the mean of its divisors is an integer number (3177090).

Almost surely, 2^21126895 is an apocalyptic number.

21126895 is a deficient number, since it is larger than the sum of its proper divisors (4289825).

21126895 is a wasteful number, since it uses less digits than its factorization.

21126895 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10745.

The product of its digits is 8640, while the sum is 34.

The square root of 21126895 is about 4596.4002219128. The cubic root of 21126895 is about 276.4470063368.

The spelling of 21126895 in words is "twenty-one million, one hundred twenty-six thousand, eight hundred ninety-five".