21614855 has 8 divisors (see below), whose sum is σ = 25964064. Its totient is φ = 17274400.

The previous prime is 21614851. The next prime is 21614863. The reversal of 21614855 is 55841612.

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

It is not a de Polignac number, because 21614855 - 2² = 21614851 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 (21614851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6125 + ... + 8985.

It is an arithmetic number, because the mean of its divisors is an integer number (3245508).

Almost surely, 2^21614855 is an apocalyptic number.

21614855 is a deficient number, since it is larger than the sum of its proper divisors (4349209).

21614855 is a wasteful number, since it uses less digits than its factorization.

21614855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4377.

The product of its digits is 9600, while the sum is 32.

The square root of 21614855 is about 4649.1778843146. The cubic root of 21614855 is about 278.5591587220.

The spelling of 21614855 in words is "twenty-one million, six hundred fourteen thousand, eight hundred fifty-five".