21112221002022 has 64 divisors (see below), whose sum is σ = 48447955077120. Its totient is φ = 6807794061600.

The previous prime is 21112221001973. The next prime is 21112221002027. The reversal of 21112221002022 is 22020012221112.

It is a happy number.

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 = 21112221001986 and 21112221002004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21112221002027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1981633 + ... + 6793475.

It is an arithmetic number, because the mean of its divisors is an integer number (756999298080).

Almost surely, 2^{21112221002022} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21112221002022, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24223977538560).

21112221002022 is an abundant number, since it is smaller than the sum of its proper divisors (27335734075098).

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

21112221002022 is a wasteful number, since it uses less digits than its factorization.

21112221002022 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4814506 (or 4814500 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 21112221002022 its reverse (22020012221112), we get a palindrome (43132233223134).

The spelling of 21112221002022 in words is "twenty-one trillion, one hundred twelve billion, two hundred twenty-one million, two thousand, twenty-two".