21210111112201 has 12 divisors (see below), whose sum is σ = 23313707645956. Its totient is φ = 19281824543520.

The previous prime is 21210111112199. The next prime is 21210111112219. The reversal of 21210111112201 is 10221111101212.

It can be written as a sum of positive squares in 2 ways, for example, as 10145174152201 + 11064936960000 = 3185149^2 + 3326400^2 .

It is not a de Polignac number, because 21210111112201 - 2¹ = 21210111112199 is a prime.

It is a super-2 number, since 2×21210111112201² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21210111112231) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 39812155 + ... + 40341391.

Almost surely, 2^{21210111112201} is an apocalyptic number.

It is an amenable number.

21210111112201 is a deficient number, since it is larger than the sum of its proper divisors (2103596533755).

21210111112201 is a wasteful number, since it uses less digits than its factorization.

21210111112201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 860472 (or 860461 counting only the distinct ones).

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

Adding to 21210111112201 its reverse (10221111101212), we get a palindrome (31431222213413).

It can be divided in two parts, 21210111 and 112201, that added together give a palindrome (21322312).

The spelling of 21210111112201 in words is "twenty-one trillion, two hundred ten billion, one hundred eleven million, one hundred twelve thousand, two hundred one".