21486460 has 24 divisors (see below), whose sum is σ = 46223856. Its totient is φ = 8384640.

The previous prime is 21486449. The next prime is 21486461. The reversal of 21486460 is 6468412.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21486461) 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, 12282 + ... + 13921.

It is an arithmetic number, because the mean of its divisors is an integer number (1925994).

Almost surely, 2^21486460 is an apocalyptic number.

21486460 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21486460 is an abundant number, since it is smaller than the sum of its proper divisors (24737396).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21486460 is a wasteful number, since it uses less digits than its factorization.

21486460 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26253 (or 26251 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 31.

The square root of 21486460 is about 4635.3489620524. The cubic root of 21486460 is about 278.0065039970.

The spelling of 21486460 in words is "twenty-one million, four hundred eighty-six thousand, four hundred sixty".