21210111201101 has 16 divisors (see below), whose sum is σ = 21704989158720. Its totient is φ = 20721444739200.

The previous prime is 21210111201017. The next prime is 21210111201131. The reversal of 21210111201101 is 10110211101212.

It is not a de Polignac number, because 21210111201101 - 2³⁴ = 21192931331917 is a prime.

It is a super-2 number, since 2×21210111201101² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21210111201131) 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 15 ways as a sum of consecutive naturals, for example, 5218106 + ... + 8345588.

It is an arithmetic number, because the mean of its divisors is an integer number (1356561822420).

Almost surely, 2^{21210111201101} is an apocalyptic number.

It is an amenable number.

21210111201101 is a deficient number, since it is larger than the sum of its proper divisors (494877957619).

21210111201101 is a wasteful number, since it uses less digits than its factorization.

21210111201101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3128476.

The product of its (nonzero) digits is 8, while the sum is 14.

Adding to 21210111201101 its reverse (10110211101212), we get a palindrome (31320322302313).

The spelling of 21210111201101 in words is "twenty-one trillion, two hundred ten billion, one hundred eleven million, two hundred one thousand, one hundred one".