21460881 has 8 divisors (see below), whose sum is σ = 30815680. Its totient is φ = 13206672.

The previous prime is 21460867. The next prime is 21460889. The reversal of 21460881 is 18806412.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21460881 - 2⁵ = 21460849 is a prime.

It is a super-2 number, since 2×21460881² = 921138826592322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21460889) 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, 275101 + ... + 275178.

It is an arithmetic number, because the mean of its divisors is an integer number (3851960).

Almost surely, 2^21460881 is an apocalyptic number.

It is an amenable number.

21460881 is a deficient number, since it is larger than the sum of its proper divisors (9354799).

21460881 is a wasteful number, since it uses less digits than its factorization.

21460881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 550295.

The product of its (nonzero) digits is 3072, while the sum is 30.

The square root of 21460881 is about 4632.5890169537. The cubic root of 21460881 is about 277.8961406628.

The spelling of 21460881 in words is "twenty-one million, four hundred sixty thousand, eight hundred eighty-one".