21102121132011 has 6 divisors (see below), whose sum is σ = 30480841635140. Its totient is φ = 14068080754668.

The previous prime is 21102121131997. The next prime is 21102121132039. The reversal of 21102121132011 is 11023112120112.

It is a happy number.

21102121132011 is a `hidden beast` number, since 2 + 110 + 21 + 211 + 320 + 1 + 1 = 666.

It is not a de Polignac number, because 21102121132011 - 2¹⁸ = 21102120869867 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21102121134011) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1172340062881 + ... + 1172340062898.

Almost surely, 2^{21102121132011} is an apocalyptic number.

21102121132011 is a deficient number, since it is larger than the sum of its proper divisors (9378720503129).

21102121132011 is a wasteful number, since it uses less digits than its factorization.

21102121132011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2344680125785 (or 2344680125782 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 18.

Adding to 21102121132011 its reverse (11023112120112), we get a palindrome (32125233252123).

The spelling of 21102121132011 in words is "twenty-one trillion, one hundred two billion, one hundred twenty-one million, one hundred thirty-two thousand, eleven".