21220102222 has 16 divisors (see below), whose sum is σ = 35067607344. Its totient is φ = 9550000000.

The previous prime is 21220102171. The next prime is 21220102223. The reversal of 21220102222 is 22220102212.

It is a junction number, because it is equal to n+sod(n) for n = 21220102196 and 21220102205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21220102223) 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, 4772779 + ... + 4777222.

It is an arithmetic number, because the mean of its divisors is an integer number (2191725459).

Almost surely, 2^21220102222 is an apocalyptic number.

21220102222 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21220102222 is a deficient number, since it is larger than the sum of its proper divisors (13847505122).

21220102222 is a wasteful number, since it uses less digits than its factorization.

21220102222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9550115.

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

Adding to 21220102222 its reverse (22220102212), we get a palindrome (43440204434).

The spelling of 21220102222 in words is "twenty-one billion, two hundred twenty million, one hundred two thousand, two hundred twenty-two".