21676347 has 48 divisors (see below), whose sum is σ = 40335360. Its totient is φ = 10886400.

The previous prime is 21676337. The next prime is 21676351. The reversal of 21676347 is 74367612.

21676347 is a `hidden beast` number, since 2 + 16 + 7 + 634 + 7 = 666.

It is not a de Polignac number, because 21676347 - 2⁷ = 21676219 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is not an unprimeable number, because it can be changed into a prime (21676337) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 20979 + ... + 21987.

It is an arithmetic number, because the mean of its divisors is an integer number (840320).

Almost surely, 2^21676347 is an apocalyptic number.

21676347 is a deficient number, since it is larger than the sum of its proper divisors (18659013).

21676347 is a wasteful number, since it uses less digits than its factorization.

21676347 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1064 (or 1061 counting only the distinct ones).

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

The square root of 21676347 is about 4655.7863997396. The cubic root of 21676347 is about 278.8230658336.

The spelling of 21676347 in words is "twenty-one million, six hundred seventy-six thousand, three hundred forty-seven".