21460905 has 48 divisors (see below), whose sum is σ = 38787840. Its totient is φ = 10969344.

The previous prime is 21460889. The next prime is 21460927. The reversal of 21460905 is 50906412.

It is not a de Polignac number, because 21460905 - 2⁴ = 21460889 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 154326 + ... + 154464.

It is an arithmetic number, because the mean of its divisors is an integer number (808080).

Almost surely, 2^21460905 is an apocalyptic number.

It is an amenable number.

21460905 is a deficient number, since it is larger than the sum of its proper divisors (17326935).

21460905 is a wasteful number, since it uses less digits than its factorization.

21460905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 270 (or 267 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 21460905 is about 4632.5916072972. The cubic root of 21460905 is about 277.8962442545.

The spelling of 21460905 in words is "twenty-one million, four hundred sixty thousand, nine hundred five".