21002022111222 has 64 divisors (see below), whose sum is σ = 49419788221440. Its totient is φ = 6588434268288.

The previous prime is 21002022111173. The next prime is 21002022111229. The reversal of 21002022111222 is 22211122020012.

It is a happy number.

21002022111222 is a `hidden beast` number, since 210 + 0 + 2 + 0 + 221 + 11 + 222 = 666.

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 = 21002022111195 and 21002022111204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21002022111229) 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, 13285183 + ... + 14781749.

It is an arithmetic number, because the mean of its divisors is an integer number (772184190960).

Almost surely, 2^{21002022111222} is an apocalyptic number.

21002022111222 is an abundant number, since it is smaller than the sum of its proper divisors (28417766110218).

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

21002022111222 is a wasteful number, since it uses less digits than its factorization.

21002022111222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1511882 (or 1511876 counting only the distinct ones).

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

Adding to 21002022111222 its reverse (22211122020012), we get a palindrome (43213144131234).

The spelling of 21002022111222 in words is "twenty-one trillion, two billion, twenty-two million, one hundred eleven thousand, two hundred twenty-two".