21000622 has 4 divisors (see below), whose sum is σ = 31500936. Its totient is φ = 10500310.

The previous prime is 21000613. The next prime is 21000673. The reversal of 21000622 is 22600012.

It is a happy number.

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

It is a super-2 number, since 2×21000622² = 882052248773768, which contains 22 as substring.

It is a Smith number, since the sum of its digits (13) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

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 as a sum of consecutive naturals, namely, 5250154 + ... + 5250157.

It is an arithmetic number, because the mean of its divisors is an integer number (7875234).

Almost surely, 2^21000622 is an apocalyptic number.

21000622 is a deficient number, since it is larger than the sum of its proper divisors (10500314).

21000622 is a wasteful number, since it uses less digits than its factorization.

21000622 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10500313.

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 21000622 is about 4582.6435602172. The cubic root of 21000622 is about 275.8951415014.

Adding to 21000622 its reverse (22600012), we get a palindrome (43600634).

The spelling of 21000622 in words is "twenty-one million, six hundred twenty-two", and thus it is an aban number.