21121110210211 has 16 divisors (see below), whose sum is σ = 23169404014848. Its totient is φ = 19094190069600.

The previous prime is 21121110210209. The next prime is 21121110210283. The reversal of 21121110210211 is 11201201112112.

It is a cyclic number.

It is not a de Polignac number, because 21121110210211 - 2¹ = 21121110210209 is a prime.

It is a super-2 number, since 2×21121110210211² (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 (21121110216211) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 55212946 + ... + 55594168.

It is an arithmetic number, because the mean of its divisors is an integer number (1448087750928).

Almost surely, 2^{21121110210211} is an apocalyptic number.

21121110210211 is a deficient number, since it is larger than the sum of its proper divisors (2048293804637).

21121110210211 is a wasteful number, since it uses less digits than its factorization.

21121110210211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 409242.

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

Adding to 21121110210211 its reverse (11201201112112), we get a palindrome (32322311322323).

The spelling of 21121110210211 in words is "twenty-one trillion, one hundred twenty-one billion, one hundred ten million, two hundred ten thousand, two hundred eleven".