10121112109 has 4 divisors (see below), whose sum is σ = 10653802240. Its totient is φ = 9588421980.

The previous prime is 10121112103. The next prime is 10121112137. The reversal of 10121112109 is 90121112101.

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, and also an emirpimes, since its reverse is a distinct semiprime: 90121112101 = 2969 ⋅30354029.

It is a cyclic number.

It is not a de Polignac number, because 10121112109 - 2¹⁵ = 10121079341 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19), and also a Moran number because the ratio is a prime number: 532690111 = 10121112109 / (1 + 0 + 1 + 2 + 1 + 1 + 1 + 2 + 1 + 0 + 9).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10121112103) 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, 266345037 + ... + 266345074.

It is an arithmetic number, because the mean of its divisors is an integer number (2663450560).

Almost surely, 2^10121112109 is an apocalyptic number.

10121112109 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

10121112109 is a deficient number, since it is larger than the sum of its proper divisors (532690131).

10121112109 is an equidigital number, since it uses as much as digits as its factorization.

10121112109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 532690130.

The product of its (nonzero) digits is 36, while the sum is 19.

The spelling of 10121112109 in words is "ten billion, one hundred twenty-one million, one hundred twelve thousand, one hundred nine".