21100002222 has 16 divisors (see below), whose sum is σ = 45446158800. Its totient is φ = 6492308352.

The previous prime is 21100002221. The next prime is 21100002233. The reversal of 21100002222 is 22220000112.

It is a junction number, because it is equal to n+sod(n) for n = 21100002198 and 21100002207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21100002221) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 135256347 + ... + 135256502.

It is an arithmetic number, because the mean of its divisors is an integer number (2840384925).

Almost surely, 2^21100002222 is an apocalyptic number.

21100002222 is an abundant number, since it is smaller than the sum of its proper divisors (24346156578).

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

21100002222 is a wasteful number, since it uses less digits than its factorization.

21100002222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 270512867.

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

Adding to 21100002222 its reverse (22220000112), we get a palindrome (43320002334).

The spelling of 21100002222 in words is "twenty-one billion, one hundred million, two thousand, two hundred twenty-two".