21663483 has 4 divisors (see below), whose sum is σ = 28884648. Its totient is φ = 14442320.

The previous prime is 21663437. The next prime is 21663497. The reversal of 21663483 is 38436612.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21663483 - 2⁶ = 21663419 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21663403) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3610578 + ... + 3610583.

It is an arithmetic number, because the mean of its divisors is an integer number (7221162).

Almost surely, 2^21663483 is an apocalyptic number.

21663483 is a deficient number, since it is larger than the sum of its proper divisors (7221165).

21663483 is an equidigital number, since it uses as much as digits as its factorization.

21663483 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7221164.

The product of its digits is 20736, while the sum is 33.

The square root of 21663483 is about 4654.4046880348. The cubic root of 21663483 is about 278.7678983326.

The spelling of 21663483 in words is "twenty-one million, six hundred sixty-three thousand, four hundred eighty-three".