21021022212222 has 16 divisors (see below), whose sum is σ = 44515105861392. Its totient is φ = 6594830497920.

The previous prime is 21021022212221. The next prime is 21021022212241. The reversal of 21021022212222 is 22221222012012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21021022212221) 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, 103044226429 + ... + 103044226632.

It is an arithmetic number, because the mean of its divisors is an integer number (2782194116337).

Almost surely, 2^{21021022212222} is an apocalyptic number.

21021022212222 is an abundant number, since it is smaller than the sum of its proper divisors (23494083649170).

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

21021022212222 is a wasteful number, since it uses less digits than its factorization.

21021022212222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 206088453083.

The product of its (nonzero) digits is 512, while the sum is 21.

Adding to 21021022212222 its reverse (22221222012012), we get a palindrome (43242244224234).

The spelling of 21021022212222 in words is "twenty-one trillion, twenty-one billion, twenty-two million, two hundred twelve thousand, two hundred twenty-two".