110123021009 has 2 divisors, whose sum is σ = 110123021010. Its totient is φ = 110123021008.

The previous prime is 110123021003. The next prime is 110123021033. The reversal of 110123021009 is 900120321011.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 103259395600 + 6863625409 = 321340^2 + 82847^2 .

It is a cyclic number.

It is not a de Polignac number, because 110123021009 - 2³² = 105828053713 is a prime.

It is a super-2 number, since 2×110123021009² (a number of 23 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (110123021003) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55061510504 + 55061510505.

It is an arithmetic number, because the mean of its divisors is an integer number (55061510505).

Almost surely, 2^110123021009 is an apocalyptic number.

It is an amenable number.

110123021009 is a deficient number, since it is larger than the sum of its proper divisors (1).

110123021009 is an equidigital number, since it uses as much as digits as its factorization.

110123021009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 108, while the sum is 20.

The spelling of 110123021009 in words is "one hundred ten billion, one hundred twenty-three million, twenty-one thousand, nine".