21201022222 has 16 divisors (see below), whose sum is σ = 31846776192. Its totient is φ = 10585443960.

The previous prime is 21201022147. The next prime is 21201022229. The reversal of 21201022222 is 22222010212.

It is a junction number, because it is equal to n+sod(n) for n = 21201022196 and 21201022205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21201022229) 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, 6363097 + ... + 6366427.

It is an arithmetic number, because the mean of its divisors is an integer number (1990423512).

Almost surely, 2^21201022222 is an apocalyptic number.

21201022222 is a deficient number, since it is larger than the sum of its proper divisors (10645753970).

21201022222 is a wasteful number, since it uses less digits than its factorization.

21201022222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6903.

The product of its (nonzero) digits is 128, while the sum is 16.

Adding to 21201022222 its reverse (22222010212), we get a palindrome (43423032434).

The spelling of 21201022222 in words is "twenty-one billion, two hundred one million, twenty-two thousand, two hundred twenty-two".