21626002 has 4 divisors (see below), whose sum is σ = 32439006. Its totient is φ = 10813000.

The previous prime is 21625993. The next prime is 21626029. The reversal of 21626002 is 20062612.

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., 18671041 + 2954961 = 4321^2 + 1719^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5406499 + ... + 5406502.

Almost surely, 2^21626002 is an apocalyptic number.

21626002 is a deficient number, since it is larger than the sum of its proper divisors (10813004).

21626002 is a wasteful number, since it uses less digits than its factorization.

21626002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10813003.

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 21626002 is about 4650.3765438941. The cubic root of 21626002 is about 278.6070357540.

Adding to 21626002 its reverse (20062612), we get a palindrome (41688614).

The spelling of 21626002 in words is "twenty-one million, six hundred twenty-six thousand, two".