21222102201021 has 20 divisors (see below), whose sum is σ = 31713925054812. Its totient is φ = 14142814342848.

The previous prime is 21222102201019. The next prime is 21222102201029. The reversal of 21222102201021 is 12010220122212.

It is a happy number.

21222102201021 is a `hidden beast` number, since 212 + 2 + 210 + 220 + 1 + 0 + 21 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 2881319528025 + 18340782672996 = 1697445^2 + 4282614^2 .

It is not a de Polignac number, because 21222102201021 - 2¹ = 21222102201019 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21222102200985 and 21222102201003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21222102201029) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 48426736 + ... + 48863001.

Almost surely, 2^{21222102201021} is an apocalyptic number.

It is an amenable number.

21222102201021 is a deficient number, since it is larger than the sum of its proper divisors (10491822853791).

21222102201021 is an equidigital number, since it uses as much as digits as its factorization.

21222102201021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97292442 (or 97292433 counting only the distinct ones).

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

Adding to 21222102201021 its reverse (12010220122212), we get a palindrome (33232322323233).

The spelling of 21222102201021 in words is "twenty-one trillion, two hundred twenty-two billion, one hundred two million, two hundred one thousand, twenty-one".