20910572129 has 2 divisors, whose sum is σ = 20910572130. Its totient is φ = 20910572128.

The previous prime is 20910572087. The next prime is 20910572201. The reversal of 20910572129 is 92127501902.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19387777600 + 1522794529 = 139240^2 + 39023^2 .

It is a cyclic number.

It is not a de Polignac number, because 20910572129 - 2⁸ = 20910571873 is a prime.

It is a super-2 number, since 2×20910572129² (a number of 21 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20910572092 and 20910572101.

It is not a weakly prime, because it can be changed into another prime (20910574129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10455286064 + 10455286065.

It is an arithmetic number, because the mean of its divisors is an integer number (10455286065).

Almost surely, 2^20910572129 is an apocalyptic number.

It is an amenable number.

20910572129 is a deficient number, since it is larger than the sum of its proper divisors (1).

20910572129 is an equidigital number, since it uses as much as digits as its factorization.

20910572129 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 22680, while the sum is 38.

The spelling of 20910572129 in words is "twenty billion, nine hundred ten million, five hundred seventy-two thousand, one hundred twenty-nine".