21012002002222 has 128 divisors (see below), whose sum is σ = 41306527899648. Its totient is φ = 7777968105600.

The previous prime is 21012002002181. The next prime is 21012002002223. The reversal of 21012002002222 is 22220020021012.

It is a junction number, because it is equal to n+sod(n) for n = 21012002002196 and 21012002002205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21012002002223) 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 63 ways as a sum of consecutive naturals, for example, 1201294897 + ... + 1201312387.

It is an arithmetic number, because the mean of its divisors is an integer number (322707249216).

Almost surely, 2^{21012002002222} is an apocalyptic number.

21012002002222 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21012002002222 is a deficient number, since it is larger than the sum of its proper divisors (20294525897426).

21012002002222 is a wasteful number, since it uses less digits than its factorization.

21012002002222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22494.

The product of its (nonzero) digits is 128, while the sum is 16.

Adding to 21012002002222 its reverse (22220020021012), we get a palindrome (43232022023234).

The spelling of 21012002002222 in words is "twenty-one trillion, twelve billion, two million, two thousand, two hundred twenty-two".