21202100022222 has 320 divisors, whose sum is σ = 56511970099200. Its totient is φ = 5813082858240.

The previous prime is 21202100022167. The next prime is 21202100022241. The reversal of 21202100022222 is 22222000120212.

21202100022222 is a `hidden beast` number, since 212 + 0 + 210 + 0 + 0 + 22 + 222 = 666.

It is a super-2 number, since 2×21202100022222² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 21202100022195 and 21202100022204.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 5272840572 + ... + 5272844592.

It is an arithmetic number, because the mean of its divisors is an integer number (176599906560).

Almost surely, 2^{21202100022222} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21202100022222, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28255985049600).

21202100022222 is an abundant number, since it is smaller than the sum of its proper divisors (35309870076978).

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

21202100022222 is a wasteful number, since it uses less digits than its factorization.

21202100022222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5013 (or 5004 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

Adding to 21202100022222 its reverse (22222000120212), we get a palindrome (43424100142434).

The spelling of 21202100022222 in words is "twenty-one trillion, two hundred two billion, one hundred million, twenty-two thousand, two hundred twenty-two".