21102001221222 has 16 divisors (see below), whose sum is σ = 46893336047280. Its totient is φ = 7034000407056.

The previous prime is 21102001221101. The next prime is 21102001221253. The reversal of 21102001221222 is 22212210020112.

It is a happy number.

21102001221222 is a `hidden beast` number, since 21 + 1 + 0 + 200 + 1 + 221 + 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 = 21102001221195 and 21102001221204.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 195388900143 + ... + 195388900250.

It is an arithmetic number, because the mean of its divisors is an integer number (2930833502955).

Almost surely, 2^{21102001221222} is an apocalyptic number.

21102001221222 is an abundant number, since it is smaller than the sum of its proper divisors (25791334826058).

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

21102001221222 is a wasteful number, since it uses less digits than its factorization.

21102001221222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 390777800404 (or 390777800398 counting only the distinct ones).

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

Adding to 21102001221222 its reverse (22212210020112), we get a palindrome (43314211241334).

The spelling of 21102001221222 in words is "twenty-one trillion, one hundred two billion, one million, two hundred twenty-one thousand, two hundred twenty-two".