21676473 has 72 divisors (see below), whose sum is σ = 41496000. Its totient is φ = 10777536.

The previous prime is 21676469. The next prime is 21676481. The reversal of 21676473 is 37467612.

21676473 is a `hidden beast` number, since 2 + 1 + 6 + 7 + 647 + 3 = 666.

It is not a de Polignac number, because 21676473 - 2² = 21676469 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21676483) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 108828 + ... + 109026.

Almost surely, 2^21676473 is an apocalyptic number.

It is an amenable number.

21676473 is a deficient number, since it is larger than the sum of its proper divisors (19819527).

21676473 is a wasteful number, since it uses less digits than its factorization.

21676473 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 251 (or 241 counting only the distinct ones).

The product of its digits is 42336, while the sum is 36.

The square root of 21676473 is about 4655.7999312685. The cubic root of 21676473 is about 278.8236060790.

The spelling of 21676473 in words is "twenty-one million, six hundred seventy-six thousand, four hundred seventy-three".