20210111101129 has 2 divisors, whose sum is σ = 20210111101130. Its totient is φ = 20210111101128.

The previous prime is 20210111101049. The next prime is 20210111101151. The reversal of 20210111101129 is 92110111101202.

It is a happy number.

It is an a-pointer prime, because the next prime (20210111101151) can be obtained adding 20210111101129 to its sum of digits (22).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18805032771529 + 1405078329600 = 4336477^2 + 1185360^2 .

It is a cyclic number.

It is not a de Polignac number, because 20210111101129 - 2¹¹ = 20210111099081 is a prime.

It is not a weakly prime, because it can be changed into another prime (20210111108129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10105055550564 + 10105055550565.

It is an arithmetic number, because the mean of its divisors is an integer number (10105055550565).

Almost surely, 2^{20210111101129} is an apocalyptic number.

It is an amenable number.

20210111101129 is a deficient number, since it is larger than the sum of its proper divisors (1).

20210111101129 is an equidigital number, since it uses as much as digits as its factorization.

20210111101129 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 22.

The spelling of 20210111101129 in words is "twenty trillion, two hundred ten billion, one hundred eleven million, one hundred one thousand, one hundred twenty-nine".