21348655 has 8 divisors (see below), whose sum is σ = 25689312. Its totient is φ = 17031648.

The previous prime is 21348641. The next prime is 21348661. The reversal of 21348655 is 55684312.

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 21348655 - 2⁷ = 21348527 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21348655.

It is a congruent 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, 3859 + ... + 7588.

It is an arithmetic number, because the mean of its divisors is an integer number (3211164).

Almost surely, 2^21348655 is an apocalyptic number.

21348655 is a deficient number, since it is larger than the sum of its proper divisors (4340657).

21348655 is a wasteful number, since it uses less digits than its factorization.

21348655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11825.

The product of its digits is 28800, while the sum is 34.

The square root of 21348655 is about 4620.4604748878. The cubic root of 21348655 is about 277.4108904157.

The spelling of 21348655 in words is "twenty-one million, three hundred forty-eight thousand, six hundred fifty-five".