21121102122111 has 12 divisors (see below), whose sum is σ = 30537012884040. Its totient is φ = 14067463549680.

The previous prime is 21121102122077. The next prime is 21121102122121. The reversal of 21121102122111 is 11122120112112.

It is a happy number.

21121102122111 is a `hidden beast` number, since 211 + 21 + 10 + 212 + 211 + 1 = 666.

It is not a de Polignac number, because 21121102122111 - 2⁹ = 21121102121599 is a prime.

It is a super-2 number, since 2×21121102122111² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21121102122121) 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, 1105923121 + ... + 1105942218.

It is an arithmetic number, because the mean of its divisors is an integer number (2544751073670).

Almost surely, 2^{21121102122111} is an apocalyptic number.

21121102122111 is a deficient number, since it is larger than the sum of its proper divisors (9415910761929).

21121102122111 is a wasteful number, since it uses less digits than its factorization.

21121102122111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2211866406 (or 2211866403 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 18.

Adding to 21121102122111 its reverse (11122120112112), we get a palindrome (32243222234223).

The spelling of 21121102122111 in words is "twenty-one trillion, one hundred twenty-one billion, one hundred two million, one hundred twenty-two thousand, one hundred eleven".