21967673 has 16 divisors (see below), whose sum is σ = 27221376. Its totient is φ = 17262720.

The previous prime is 21967669. The next prime is 21967709. The reversal of 21967673 is 37676912.

It is a cyclic number.

It is not a de Polignac number, because 21967673 - 2² = 21967669 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21967673.

It is not an unprimeable number, because it can be changed into a prime (21967633) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14093 + ... + 15573.

It is an arithmetic number, because the mean of its divisors is an integer number (1701336).

Almost surely, 2^21967673 is an apocalyptic number.

It is an amenable number.

21967673 is a deficient number, since it is larger than the sum of its proper divisors (5253703).

21967673 is a wasteful number, since it uses less digits than its factorization.

21967673 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1664.

The product of its digits is 95256, while the sum is 41.

The square root of 21967673 is about 4686.9684231921. The cubic root of 21967673 is about 280.0666210522.

The spelling of 21967673 in words is "twenty-one million, nine hundred sixty-seven thousand, six hundred seventy-three".