10121122009 has 4 divisors (see below), whose sum is σ = 10561170816. Its totient is φ = 9681073204.

The previous prime is 10121122001. The next prime is 10121122031. The reversal of 10121122009 is 90022112101.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 10121122009 - 2³ = 10121122001 is a prime.

It is a super-2 number, since 2×10121122009² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (10121122001) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 220024369 + ... + 220024414.

It is an arithmetic number, because the mean of its divisors is an integer number (2640292704).

Almost surely, 2^10121122009 is an apocalyptic number.

It is an amenable number.

10121122009 is a deficient number, since it is larger than the sum of its proper divisors (440048807).

10121122009 is an equidigital number, since it uses as much as digits as its factorization.

10121122009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 440048806.

The product of its (nonzero) digits is 72, while the sum is 19.

The spelling of 10121122009 in words is "ten billion, one hundred twenty-one million, one hundred twenty-two thousand, nine".