21020221122222 has 16 divisors (see below), whose sum is σ = 48046219708032. Its totient is φ = 6005777463480.

The previous prime is 21020221122217. The next prime is 21020221122233. The reversal of 21020221122222 is 22222112202012.

It is a super-3 number, since 3×21020221122222³ (a number of 41 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

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, 250240727604 + ... + 250240727687.

It is an arithmetic number, because the mean of its divisors is an integer number (3002888731752).

Almost surely, 2^{21020221122222} is an apocalyptic number.

21020221122222 is an abundant number, since it is smaller than the sum of its proper divisors (27025998585810).

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

21020221122222 is a wasteful number, since it uses less digits than its factorization.

21020221122222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 500481455303.

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

Adding to 21020221122222 its reverse (22222112202012), we get a palindrome (43242333324234).

The spelling of 21020221122222 in words is "twenty-one trillion, twenty billion, two hundred twenty-one million, one hundred twenty-two thousand, two hundred twenty-two".