21102211022021 has 16 divisors (see below), whose sum is σ = 21566906683200. Its totient is φ = 20641997038080.

The previous prime is 21102211021993. The next prime is 21102211022023. The reversal of 21102211022021 is 12022011220112.

It is a cyclic number.

It is not a de Polignac number, because 21102211022021 - 2¹⁰ = 21102211020997 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21102211022023) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 35816306 + ... + 36400716.

It is an arithmetic number, because the mean of its divisors is an integer number (1347931667700).

Almost surely, 2^{21102211022021} is an apocalyptic number.

It is an amenable number.

21102211022021 is a deficient number, since it is larger than the sum of its proper divisors (464695661179).

21102211022021 is a wasteful number, since it uses less digits than its factorization.

21102211022021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 588244.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 21102211022021 its reverse (12022011220112), we get a palindrome (33124222242133).

The spelling of 21102211022021 in words is "twenty-one trillion, one hundred two billion, two hundred eleven million, twenty-two thousand, twenty-one".