21362673 has 4 divisors (see below), whose sum is σ = 28483568. Its totient is φ = 14241780.

The previous prime is 21362651. The next prime is 21362711. The reversal of 21362673 is 37626312.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 21362673 - 2⁵ = 21362641 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 21362673.

It is not an unprimeable number, because it can be changed into a prime (21362633) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3560443 + ... + 3560448.

It is an arithmetic number, because the mean of its divisors is an integer number (7120892).

Almost surely, 2^21362673 is an apocalyptic number.

It is an amenable number.

21362673 is a deficient number, since it is larger than the sum of its proper divisors (7120895).

21362673 is an equidigital number, since it uses as much as digits as its factorization.

21362673 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7120894.

The product of its digits is 9072, while the sum is 30.

The square root of 21362673 is about 4621.9771743270. The cubic root of 21362673 is about 277.4715951772.

Adding to 21362673 its reverse (37626312), we get a palindrome (58988985).

The spelling of 21362673 in words is "twenty-one million, three hundred sixty-two thousand, six hundred seventy-three".