21102010220121 has 8 divisors (see below), whose sum is σ = 28532295509184. Its totient is φ = 13869865872240.

The previous prime is 21102010220119. The next prime is 21102010220149. The reversal of 21102010220121 is 12102201020112.

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

It is not a de Polignac number, because 21102010220121 - 2¹ = 21102010220119 is a prime.

It is a super-2 number, since 2×21102010220121² (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 21102010220121.

It is not an unprimeable number, because it can be changed into a prime (21102010220111) 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 7 ways as a sum of consecutive naturals, for example, 49535235046 + ... + 49535235471.

It is an arithmetic number, because the mean of its divisors is an integer number (3566536938648).

Almost surely, 2^{21102010220121} is an apocalyptic number.

It is an amenable number.

21102010220121 is a deficient number, since it is larger than the sum of its proper divisors (7430285289063).

21102010220121 is an equidigital number, since it uses as much as digits as its factorization.

21102010220121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99070470591.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 21102010220121 its reverse (12102201020112), we get a palindrome (33204211240233).

The spelling of 21102010220121 in words is "twenty-one trillion, one hundred two billion, ten million, two hundred twenty thousand, one hundred twenty-one".