20111010109 has 2 divisors, whose sum is σ = 20111010110. Its totient is φ = 20111010108.

The previous prime is 20111010107. The next prime is 20111010119. The reversal of 20111010109 is 90101011102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13013790084 + 7097220025 = 114078^2 + 84245^2 .

It is a cyclic number.

It is not a de Polignac number, because 20111010109 - 2¹ = 20111010107 is a prime.

Together with 20111010107, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 20111010092 and 20111010101.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20111010107) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10055505054 + 10055505055.

It is an arithmetic number, because the mean of its divisors is an integer number (10055505055).

Almost surely, 2^20111010109 is an apocalyptic number.

It is an amenable number.

20111010109 is a deficient number, since it is larger than the sum of its proper divisors (1).

20111010109 is an equidigital number, since it uses as much as digits as its factorization.

20111010109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18, while the sum is 16.

The spelling of 20111010109 in words is "twenty billion, one hundred eleven million, ten thousand, one hundred nine".