21482905 has 4 divisors (see below), whose sum is σ = 25779492. Its totient is φ = 17186320.

The previous prime is 21482899. The next prime is 21482927. The reversal of 21482905 is 50928412.

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

It can be written as a sum of positive squares in 2 ways, for example, as 2368521 + 19114384 = 1539^2 + 4372^2 .

It is not a de Polignac number, because 21482905 - 2⁵ = 21482873 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2148286 + ... + 2148295.

It is an arithmetic number, because the mean of its divisors is an integer number (6444873).

Almost surely, 2^21482905 is an apocalyptic number.

It is an amenable number.

21482905 is a deficient number, since it is larger than the sum of its proper divisors (4296587).

21482905 is an equidigital number, since it uses as much as digits as its factorization.

21482905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4296586.

The product of its (nonzero) digits is 5760, while the sum is 31.

The square root of 21482905 is about 4634.9654799146. The cubic root of 21482905 is about 277.9911708115.

The spelling of 21482905 in words is "twenty-one million, four hundred eighty-two thousand, nine hundred five".