21887673 has 8 divisors (see below), whose sum is σ = 29315328. Its totient is φ = 14525904.

The previous prime is 21887669. The next prime is 21887689. The reversal of 21887673 is 37678812.

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

It is not a de Polignac number, because 21887673 - 2² = 21887669 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21887623) 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, 15690 + ... + 17027.

It is an arithmetic number, because the mean of its divisors is an integer number (3664416).

Almost surely, 2^21887673 is an apocalyptic number.

It is an amenable number.

21887673 is a deficient number, since it is larger than the sum of its proper divisors (7427655).

21887673 is a wasteful number, since it uses less digits than its factorization.

21887673 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32943.

The product of its digits is 112896, while the sum is 42.

The square root of 21887673 is about 4678.4263379902. The cubic root of 21887673 is about 279.7262332653.

The spelling of 21887673 in words is "twenty-one million, eight hundred eighty-seven thousand, six hundred seventy-three".