21323626 has 4 divisors (see below), whose sum is σ = 31985442. Its totient is φ = 10661812.

The previous prime is 21323611. The next prime is 21323633. The reversal of 21323626 is 62632312.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 21022225 + 301401 = 4585^2 + 549^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21323626.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5330905 + ... + 5330908.

Almost surely, 2^21323626 is an apocalyptic number.

21323626 is a deficient number, since it is larger than the sum of its proper divisors (10661816).

21323626 is a wasteful number, since it uses less digits than its factorization.

21323626 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10661815.

The product of its digits is 2592, while the sum is 25.

The square root of 21323626 is about 4617.7511842887. The cubic root of 21323626 is about 277.3024365518.

Adding to 21323626 its reverse (62632312), we get a palindrome (83955938).

The spelling of 21323626 in words is "twenty-one million, three hundred twenty-three thousand, six hundred twenty-six".