21112221110129 has 2 divisors, whose sum is σ = 21112221110130. Its totient is φ = 21112221110128.

The previous prime is 21112221110093. The next prime is 21112221110137. The reversal of 21112221110129 is 92101112221112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16652724600625 + 4459496509504 = 4080775^2 + 2111752^2 .

It is a cyclic number.

It is not a de Polignac number, because 21112221110129 - 2⁴⁴ = 3520035065713 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21112221110098 and 21112221110107.

It is not a weakly prime, because it can be changed into another prime (21112221110179) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10556110555064 + 10556110555065.

It is an arithmetic number, because the mean of its divisors is an integer number (10556110555065).

Almost surely, 2^{21112221110129} is an apocalyptic number.

It is an amenable number.

21112221110129 is a deficient number, since it is larger than the sum of its proper divisors (1).

21112221110129 is an equidigital number, since it uses as much as digits as its factorization.

21112221110129 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 26.

The spelling of 21112221110129 in words is "twenty-one trillion, one hundred twelve billion, two hundred twenty-one million, one hundred ten thousand, one hundred twenty-nine".