21222201210021 has 32 divisors (see below), whose sum is σ = 36335497017600. Its totient is φ = 11990713996800.

The previous prime is 21222201209981. The next prime is 21222201210137. The reversal of 21222201210021 is 12001210222212.

It is a happy number.

21222201210021 is a `hidden beast` number, since 212 + 2 + 220 + 1 + 210 + 0 + 21 = 666.

It is not a de Polignac number, because 21222201210021 - 2¹¹ = 21222201207973 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21222201209976 and 21222201210003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21222201200021) 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, 630807780 + ... + 630841421.

It is an arithmetic number, because the mean of its divisors is an integer number (1135484281800).

Almost surely, 2^{21222201210021} is an apocalyptic number.

21222201210021 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

21222201210021 is a deficient number, since it is larger than the sum of its proper divisors (15113295807579).

21222201210021 is a wasteful number, since it uses less digits than its factorization.

21222201210021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1261649306 (or 1261649300 counting only the distinct ones).

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

Adding to 21222201210021 its reverse (12001210222212), we get a palindrome (33223411432233).

The spelling of 21222201210021 in words is "twenty-one trillion, two hundred twenty-two billion, two hundred one million, two hundred ten thousand, twenty-one".