21120112110101 has 2 divisors, whose sum is σ = 21120112110102. Its totient is φ = 21120112110100.

The previous prime is 21120112110061. The next prime is 21120112110169. The reversal of 21120112110101 is 10101121102112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14139472542001 + 6980639568100 = 3760249^2 + 2642090^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21120112110101 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21120112116101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10560056055050 + 10560056055051.

It is an arithmetic number, because the mean of its divisors is an integer number (10560056055051).

Almost surely, 2^{21120112110101} is an apocalyptic number.

It is an amenable number.

21120112110101 is a deficient number, since it is larger than the sum of its proper divisors (1).

21120112110101 is an equidigital number, since it uses as much as digits as its factorization.

21120112110101 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8, while the sum is 14.

Adding to 21120112110101 its reverse (10101121102112), we get a palindrome (31221233212213).

The spelling of 21120112110101 in words is "twenty-one trillion, one hundred twenty billion, one hundred twelve million, one hundred ten thousand, one hundred one".