21100012222 has 4 divisors (see below), whose sum is σ = 31650018336. Its totient is φ = 10550006110.

The previous prime is 21100012189. The next prime is 21100012249. The reversal of 21100012222 is 22221000112.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5275003054 + ... + 5275003057.

It is an arithmetic number, because the mean of its divisors is an integer number (7912504584).

Almost surely, 2^21100012222 is an apocalyptic number.

21100012222 is a deficient number, since it is larger than the sum of its proper divisors (10550006114).

21100012222 is a wasteful number, since it uses less digits than its factorization.

21100012222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10550006113.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 21100012222 its reverse (22221000112), we get a palindrome (43321012334).

The spelling of 21100012222 in words is "twenty-one billion, one hundred million, twelve thousand, two hundred twenty-two".