21100212222 has 16 divisors (see below), whose sum is σ = 43340976912. Its totient is φ = 6843312000.

The previous prime is 21100212197. The next prime is 21100212223. The reversal of 21100212222 is 22221200112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21100212223) 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, 47522779 + ... + 47523222.

It is an arithmetic number, because the mean of its divisors is an integer number (2708811057).

Almost surely, 2^21100212222 is an apocalyptic number.

21100212222 is an abundant number, since it is smaller than the sum of its proper divisors (22240764690).

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

21100212222 is a wasteful number, since it uses less digits than its factorization.

21100212222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95046043.

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 21100212222 its reverse (22221200112), we get a palindrome (43321412334).

The spelling of 21100212222 in words is "twenty-one billion, one hundred million, two hundred twelve thousand, two hundred twenty-two".