21321000222 has 32 divisors (see below), whose sum is σ = 43104332544. Its totient is φ = 7030022400.

The previous prime is 21321000209. The next prime is 21321000247. The reversal of 21321000222 is 22200012312.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1231647 + ... + 1248837.

It is an arithmetic number, because the mean of its divisors is an integer number (1347010392).

Almost surely, 2^21321000222 is an apocalyptic number.

21321000222 is an abundant number, since it is smaller than the sum of its proper divisors (21783332322).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21321000222 is a wasteful number, since it uses less digits than its factorization.

21321000222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19424.

The product of its (nonzero) digits is 96, while the sum is 15.

Adding to 21321000222 its reverse (22200012312), we get a palindrome (43521012534).

The spelling of 21321000222 in words is "twenty-one billion, three hundred twenty-one million, two hundred twenty-two", and thus it is an aban number.