21101002222 has 4 divisors (see below), whose sum is σ = 31651503336. Its totient is φ = 10550501110.

The previous prime is 21101002199. The next prime is 21101002249. The reversal of 21101002222 is 22220010112.

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, 5275250554 + ... + 5275250557.

It is an arithmetic number, because the mean of its divisors is an integer number (7912875834).

Almost surely, 2^21101002222 is an apocalyptic number.

21101002222 is a deficient number, since it is larger than the sum of its proper divisors (10550501114).

21101002222 is a wasteful number, since it uses less digits than its factorization.

21101002222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10550501113.

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

Adding to 21101002222 its reverse (22220010112), we get a palindrome (43321012334).

The spelling of 21101002222 in words is "twenty-one billion, one hundred one million, two thousand, two hundred twenty-two".