21487476 has 12 divisors (see below), whose sum is σ = 50137472. Its totient is φ = 7162488.

The previous prime is 21487471. The next prime is 21487481. The reversal of 21487476 is 67478412.

It is an interprime number because it is at equal distance from previous prime (21487471) and next prime (21487481).

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21487471) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 895300 + ... + 895323.

Almost surely, 2^21487476 is an apocalyptic number.

It is an amenable number.

21487476 is an abundant number, since it is smaller than the sum of its proper divisors (28649996).

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

21487476 is a wasteful number, since it uses less digits than its factorization.

21487476 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1790630 (or 1790628 counting only the distinct ones).

The product of its digits is 75264, while the sum is 39.

The square root of 21487476 is about 4635.4585533688. The cubic root of 21487476 is about 278.0108858288.

The spelling of 21487476 in words is "twenty-one million, four hundred eighty-seven thousand, four hundred seventy-six".