21022630 has 16 divisors (see below), whose sum is σ = 38646720. Its totient is φ = 8229952.

The previous prime is 21022597. The next prime is 21022669. The reversal of 21022630 is 3622012.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21895 + ... + 22834.

It is an arithmetic number, because the mean of its divisors is an integer number (2415420).

Almost surely, 2^21022630 is an apocalyptic number.

21022630 is a deficient number, since it is larger than the sum of its proper divisors (17624090).

21022630 is a wasteful number, since it uses less digits than its factorization.

21022630 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44783.

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 21022630 is about 4585.0441655452. The cubic root of 21022630 is about 275.9914843693.

Adding to 21022630 its reverse (3622012), we get a palindrome (24644642).

The spelling of 21022630 in words is "twenty-one million, twenty-two thousand, six hundred thirty".