21022000222 has 4 divisors (see below), whose sum is σ = 31533000336. Its totient is φ = 10511000110.

The previous prime is 21022000171. The next prime is 21022000249. The reversal of 21022000222 is 22200022012.

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

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 polite number, since it can be written as a sum of consecutive naturals, namely, 5255500054 + ... + 5255500057.

It is an arithmetic number, because the mean of its divisors is an integer number (7883250084).

Almost surely, 2^21022000222 is an apocalyptic number.

21022000222 is a deficient number, since it is larger than the sum of its proper divisors (10511000114).

21022000222 is a wasteful number, since it uses less digits than its factorization.

21022000222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10511000113.

The product of its (nonzero) digits is 64, while the sum is 13.

Adding to 21022000222 its reverse (22200022012), we get a palindrome (43222022234).

The spelling of 21022000222 in words is "twenty-one billion, twenty-two million, two hundred twenty-two", and thus it is an aban number.