21460887 has 12 divisors (see below), whose sum is σ = 35427600. Its totient is φ = 12263328.

The previous prime is 21460867. The next prime is 21460889. The reversal of 21460887 is 78806412.

It is not a de Polignac number, because 21460887 - 2¹² = 21456791 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a congruent 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 11 ways as a sum of consecutive naturals, for example, 170262 + ... + 170387.

It is an arithmetic number, because the mean of its divisors is an integer number (2952300).

Almost surely, 2^21460887 is an apocalyptic number.

21460887 is a deficient number, since it is larger than the sum of its proper divisors (13966713).

21460887 is a wasteful number, since it uses less digits than its factorization.

21460887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 340662 (or 340659 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 36.

The square root of 21460887 is about 4632.5896645397. The cubic root of 21460887 is about 277.8961665608.

The spelling of 21460887 in words is "twenty-one million, four hundred sixty thousand, eight hundred eighty-seven".