21867347 has 8 divisors (see below), whose sum is σ = 23409600. Its totient is φ = 20364264.

The previous prime is 21867337. The next prime is 21867353. The reversal of 21867347 is 74376812.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21867347 - 2⁴ = 21867331 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21867347.

It is not an unprimeable number, because it can be changed into a prime (21867317) 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, 8633 + ... + 10874.

It is an arithmetic number, because the mean of its divisors is an integer number (2926200).

Almost surely, 2^21867347 is an apocalyptic number.

21867347 is a deficient number, since it is larger than the sum of its proper divisors (1542253).

21867347 is a wasteful number, since it uses less digits than its factorization.

21867347 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19585.

The product of its digits is 56448, while the sum is 38.

The square root of 21867347 is about 4676.2535217843. The cubic root of 21867347 is about 279.6396171391.

The spelling of 21867347 in words is "twenty-one million, eight hundred sixty-seven thousand, three hundred forty-seven".