21020020022222 has 16 divisors (see below), whose sum is σ = 33955765341120. Its totient is φ = 9701448164832.

The previous prime is 21020020022171. The next prime is 21020020022251. The reversal of 21020020022222 is 22222002002012.

It is a super-2 number, since 2×21020020022222² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21020020022222.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1533473 + ... + 6662700.

It is an arithmetic number, because the mean of its divisors is an integer number (2122235333820).

Almost surely, 2^{21020020022222} is an apocalyptic number.

21020020022222 is a deficient number, since it is larger than the sum of its proper divisors (12935745318898).

21020020022222 is a wasteful number, since it uses less digits than its factorization.

21020020022222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8294827.

The product of its (nonzero) digits is 256, while the sum is 17.

Adding to 21020020022222 its reverse (22222002002012), we get a palindrome (43242022024234).

The spelling of 21020020022222 in words is "twenty-one trillion, twenty billion, twenty million, twenty-two thousand, two hundred twenty-two".