21220020222 has 32 divisors (see below), whose sum is σ = 42851607552. Its totient is φ = 7004792064.

The previous prime is 21220020187. The next prime is 21220020223. The reversal of 21220020222 is 22202002212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21220020223) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3468238 + ... + 3474350.

It is an arithmetic number, because the mean of its divisors is an integer number (1339112736).

Almost surely, 2^21220020222 is an apocalyptic number.

21220020222 is an abundant number, since it is smaller than the sum of its proper divisors (21631587330).

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

21220020222 is a wasteful number, since it uses less digits than its factorization.

21220020222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11632.

The product of its (nonzero) digits is 128, while the sum is 15.

Adding to 21220020222 its reverse (22202002212), we get a palindrome (43422022434).

The spelling of 21220020222 in words is "twenty-one billion, two hundred twenty million, twenty thousand, two hundred twenty-two".