21222221002002 has 48 divisors (see below), whose sum is σ = 46028175485760. Its totient is φ = 7066893115296.

The previous prime is 21222221001983. The next prime is 21222221002013. The reversal of 21222221002002 is 20020012222212.

21222221002002 is a `hidden beast` number, since 21 + 222 + 221 + 0 + 0 + 200 + 2 = 666.

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

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 72645993 + ... + 72937539.

It is an arithmetic number, because the mean of its divisors is an integer number (958920322620).

Almost surely, 2^{21222221002002} is an apocalyptic number.

21222221002002 is an abundant number, since it is smaller than the sum of its proper divisors (24805954483758).

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

21222221002002 is a wasteful number, since it uses less digits than its factorization.

21222221002002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 295647 (or 295644 counting only the distinct ones).

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

Adding to 21222221002002 its reverse (20020012222212), we get a palindrome (41242233224214).

The spelling of 21222221002002 in words is "twenty-one trillion, two hundred twenty-two billion, two hundred twenty-one million, two thousand, two".