20111201129 has 2 divisors, whose sum is σ = 20111201130. Its totient is φ = 20111201128.

The previous prime is 20111201107. The next prime is 20111201137. The reversal of 20111201129 is 92110211102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20092495504 + 18705625 = 141748^2 + 4325^2 .

It is a cyclic number.

It is not a de Polignac number, because 20111201129 - 2¹⁶ = 20111135593 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20111201129.

It is not a weakly prime, because it can be changed into another prime (20111201029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10055600564 + 10055600565.

It is an arithmetic number, because the mean of its divisors is an integer number (10055600565).

Almost surely, 2^20111201129 is an apocalyptic number.

It is an amenable number.

20111201129 is a deficient number, since it is larger than the sum of its proper divisors (1).

20111201129 is an equidigital number, since it uses as much as digits as its factorization.

20111201129 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 20.

The spelling of 20111201129 in words is "twenty billion, one hundred eleven million, two hundred one thousand, one hundred twenty-nine".