21011110102221 has 8 divisors (see below), whose sum is σ = 28329586655040. Its totient is φ = 13850020142112.

The previous prime is 21011110102181. The next prime is 21011110102253. The reversal of 21011110102221 is 12220101111012.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21011110102221 - 2¹⁹ = 21011109577933 is a prime.

It is a super-2 number, since 2×21011110102221² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21011110102221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21011110102291) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39346647865 + ... + 39346648398.

It is an arithmetic number, because the mean of its divisors is an integer number (3541198331880).

Almost surely, 2^{21011110102221} is an apocalyptic number.

It is an amenable number.

21011110102221 is a deficient number, since it is larger than the sum of its proper divisors (7318476552819).

21011110102221 is an equidigital number, since it uses as much as digits as its factorization.

21011110102221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78693296355.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 21011110102221 its reverse (12220101111012), we get a palindrome (33231211213233).

The spelling of 21011110102221 in words is "twenty-one trillion, eleven billion, one hundred ten million, one hundred two thousand, two hundred twenty-one".