21410663 has 8 divisors (see below), whose sum is σ = 22580400. Its totient is φ = 20245248.

The previous prime is 21410657. The next prime is 21410693. The reversal of 21410663 is 36601412.

It is a happy number.

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 21410663 - 2⁴ = 21410647 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 (21410693) 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, 17045 + ... + 18257.

It is an arithmetic number, because the mean of its divisors is an integer number (2822550).

Almost surely, 2^21410663 is an apocalyptic number.

21410663 is a deficient number, since it is larger than the sum of its proper divisors (1169737).

21410663 is a wasteful number, since it uses less digits than its factorization.

21410663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2161.

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 21410663 is about 4627.1657631859. The cubic root of 21410663 is about 277.6792143762.

The spelling of 21410663 in words is "twenty-one million, four hundred ten thousand, six hundred sixty-three".