21210122111101 has 64 divisors (see below), whose sum is σ = 26830132655616. Its totient is φ = 16423544586240.

The previous prime is 21210122111089. The next prime is 21210122111107. The reversal of 21210122111101 is 10111122101212.

It is not a de Polignac number, because 21210122111101 - 2²⁹ = 21209585240189 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21210122111107) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1756816801 + ... + 1756828873.

It is an arithmetic number, because the mean of its divisors is an integer number (419220822744).

Almost surely, 2^{21210122111101} is an apocalyptic number.

It is an amenable number.

21210122111101 is a deficient number, since it is larger than the sum of its proper divisors (5620010544515).

21210122111101 is a wasteful number, since it uses less digits than its factorization.

21210122111101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13283 (or 13261 counting only the distinct ones).

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

Adding to 21210122111101 its reverse (10111122101212), we get a palindrome (31321244212313).

The spelling of 21210122111101 in words is "twenty-one trillion, two hundred ten billion, one hundred twenty-two million, one hundred eleven thousand, one hundred one".