21210110202111 has 4 divisors (see below), whose sum is σ = 28280146936152. Its totient is φ = 14140073468072.

The previous prime is 21210110202101. The next prime is 21210110202179. The reversal of 21210110202111 is 11120201101212.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21210110202111 - 2⁷ = 21210110201983 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21210110202101) 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, 3535018367016 + ... + 3535018367021.

It is an arithmetic number, because the mean of its divisors is an integer number (7070036734038).

Almost surely, 2^{21210110202111} is an apocalyptic number.

21210110202111 is a deficient number, since it is larger than the sum of its proper divisors (7070036734041).

21210110202111 is an equidigital number, since it uses as much as digits as its factorization.

21210110202111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7070036734040.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 21210110202111 its reverse (11120201101212), we get a palindrome (32330311303323).

The spelling of 21210110202111 in words is "twenty-one trillion, two hundred ten billion, one hundred ten million, two hundred two thousand, one hundred eleven".