21100020222 has 32 divisors (see below), whose sum is σ = 42422271264. Its totient is φ = 6996377600.

The previous prime is 21100020143. The next prime is 21100020241. The reversal of 21100020222 is 22202000112.

It is a junction number, because it is equal to n+sod(n) for n = 21100020198 and 21100020207.

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, 1164472 + ... + 1182452.

It is an arithmetic number, because the mean of its divisors is an integer number (1325695977).

Almost surely, 2^21100020222 is an apocalyptic number.

21100020222 is an abundant number, since it is smaller than the sum of its proper divisors (21322251042).

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

21100020222 is a wasteful number, since it uses less digits than its factorization.

21100020222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19004.

The product of its (nonzero) digits is 32, while the sum is 12.

Adding to 21100020222 its reverse (22202000112), we get a palindrome (43302020334).

The spelling of 21100020222 in words is "twenty-one billion, one hundred million, twenty thousand, two hundred twenty-two".