21020022222 has 16 divisors (see below), whose sum is σ = 42371069952. Its totient is φ = 6951503160.

The previous prime is 21020022209. The next prime is 21020022241. The reversal of 21020022222 is 22222002012.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13791904 + ... + 13793427.

It is an arithmetic number, because the mean of its divisors is an integer number (2648191872).

Almost surely, 2^21020022222 is an apocalyptic number.

21020022222 is an abundant number, since it is smaller than the sum of its proper divisors (21351047730).

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

21020022222 is a wasteful number, since it uses less digits than its factorization.

21020022222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27585463.

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

Adding to 21020022222 its reverse (22222002012), we get a palindrome (43242024234).

The spelling of 21020022222 in words is "twenty-one billion, twenty million, twenty-two thousand, two hundred twenty-two".