21111213031101 has 48 divisors (see below), whose sum is σ = 33476104217088. Its totient is φ = 12762481075200.

The previous prime is 21111213031093. The next prime is 21111213031141. The reversal of 21111213031101 is 10113031211112.

21111213031101 is a `hidden beast` number, since 211 + 1 + 12 + 130 + 311 + 0 + 1 = 666.

It is not a de Polignac number, because 21111213031101 - 2³ = 21111213031093 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21111213031141) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 8727360 + ... + 10880681.

It is an arithmetic number, because the mean of its divisors is an integer number (697418837856).

Almost surely, 2^{21111213031101} is an apocalyptic number.

It is an amenable number.

21111213031101 is a deficient number, since it is larger than the sum of its proper divisors (12364891185987).

21111213031101 is a wasteful number, since it uses less digits than its factorization.

21111213031101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19608322 (or 19608319 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 18.

Adding to 21111213031101 its reverse (10113031211112), we get a palindrome (31224244242213).

The spelling of 21111213031101 in words is "twenty-one trillion, one hundred eleven billion, two hundred thirteen million, thirty-one thousand, one hundred one".