20113102081 has 2 divisors, whose sum is σ = 20113102082. Its totient is φ = 20113102080.

The previous prime is 20113102049. The next prime is 20113102103. The reversal of 20113102081 is 18020131102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18160257600 + 1952844481 = 134760^2 + 44191^2 .

It is a cyclic number.

It is not a de Polignac number, because 20113102081 - 2⁵ = 20113102049 is a prime.

It is a super-2 number, since 2×20113102081² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20113102021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10056551040 + 10056551041.

It is an arithmetic number, because the mean of its divisors is an integer number (10056551041).

Almost surely, 2^20113102081 is an apocalyptic number.

It is an amenable number.

20113102081 is a deficient number, since it is larger than the sum of its proper divisors (1).

20113102081 is an equidigital number, since it uses as much as digits as its factorization.

20113102081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96, while the sum is 19.

Adding to 20113102081 its reverse (18020131102), we get a palindrome (38133233183).

The spelling of 20113102081 in words is "twenty billion, one hundred thirteen million, one hundred two thousand, eighty-one".