21111222112101 has 32 divisors (see below), whose sum is σ = 34128849744000. Its totient is φ = 12791041482240.

The previous prime is 21111222112063. The next prime is 21111222112177. The reversal of 21111222112101 is 10121122211112.

It is a happy number.

21111222112101 is a `hidden beast` number, since 211 + 11 + 22 + 211 + 210 + 1 = 666.

It is a de Polignac number, because none of the positive numbers 2^k-21111222112101 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21111222112801) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9060876 + ... + 11149973.

It is an arithmetic number, because the mean of its divisors is an integer number (1066526554500).

Almost surely, 2^{21111222112101} is an apocalyptic number.

It is an amenable number.

21111222112101 is a deficient number, since it is larger than the sum of its proper divisors (13017627631899).

21111222112101 is a wasteful number, since it uses less digits than its factorization.

21111222112101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20214386 (or 20214380 counting only the distinct ones).

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

Adding to 21111222112101 its reverse (10121122211112), we get a palindrome (31232344323213).

The spelling of 21111222112101 in words is "twenty-one trillion, one hundred eleven billion, two hundred twenty-two million, one hundred twelve thousand, one hundred one".