21001100222 has 32 divisors (see below), whose sum is σ = 33625912320. Its totient is φ = 9814948000.

The previous prime is 21001100213. The next prime is 21001100227. The reversal of 21001100222 is 22200110012.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21001100227) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 594779 + ... + 629097.

It is an arithmetic number, because the mean of its divisors is an integer number (1050809760).

Almost surely, 2^21001100222 is an apocalyptic number.

21001100222 is a deficient number, since it is larger than the sum of its proper divisors (12624812098).

21001100222 is a wasteful number, since it uses less digits than its factorization.

21001100222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34648.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 21001100222 its reverse (22200110012), we get a palindrome (43201210234).

The spelling of 21001100222 in words is "twenty-one billion, one million, one hundred thousand, two hundred twenty-two".