21110212102201 has 4 divisors (see below), whose sum is σ = 21559365551232. Its totient is φ = 20661058653172.

The previous prime is 21110212102183. The next prime is 21110212102241. The reversal of 21110212102201 is 10220121201112.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21110212102201 - 2¹⁷ = 21110211971129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21110212102241) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 224576724445 + ... + 224576724538.

It is an arithmetic number, because the mean of its divisors is an integer number (5389841387808).

Almost surely, 2^{21110212102201} is an apocalyptic number.

It is an amenable number.

21110212102201 is a deficient number, since it is larger than the sum of its proper divisors (449153449031).

21110212102201 is an equidigital number, since it uses as much as digits as its factorization.

21110212102201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 449153449030.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 21110212102201 its reverse (10220121201112), we get a palindrome (31330333303313).

The spelling of 21110212102201 in words is "twenty-one trillion, one hundred ten billion, two hundred twelve million, one hundred two thousand, two hundred one".