21102212100221 has 8 divisors (see below), whose sum is σ = 24122612567040. Its totient is φ = 18083261317968.

The previous prime is 21102212100161. The next prime is 21102212100247. The reversal of 21102212100221 is 12200121220112.

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

It is a de Polignac number, because none of the positive numbers 2^k-21102212100221 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21102212100221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21102412100221) 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, 362389946 + ... + 362448171.

It is an arithmetic number, because the mean of its divisors is an integer number (3015326570880).

Almost surely, 2^{21102212100221} is an apocalyptic number.

It is an amenable number.

21102212100221 is a deficient number, since it is larger than the sum of its proper divisors (3020400466819).

21102212100221 is an equidigital number, since it uses as much as digits as its factorization.

21102212100221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 724842283.

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

Adding to 21102212100221 its reverse (12200121220112), we get a palindrome (33302333320333).

The spelling of 21102212100221 in words is "twenty-one trillion, one hundred two billion, two hundred twelve million, one hundred thousand, two hundred twenty-one".