10120666121 has 4 divisors (see below), whose sum is σ = 10210229652. Its totient is φ = 10031102592.

The previous prime is 10120666111. The next prime is 10120666159. The reversal of 10120666121 is 12166602101.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3325136896 + 6795529225 = 57664^2 + 82435^2 .

It is a cyclic number.

It is not a de Polignac number, because 10120666121 - 2²² = 10116471817 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (10120666111) 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, 44781596 + ... + 44781821.

It is an arithmetic number, because the mean of its divisors is an integer number (2552557413).

Almost surely, 2^10120666121 is an apocalyptic number.

It is an amenable number.

10120666121 is a deficient number, since it is larger than the sum of its proper divisors (89563531).

10120666121 is an equidigital number, since it uses as much as digits as its factorization.

10120666121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89563530.

The product of its (nonzero) digits is 864, while the sum is 26.

The spelling of 10120666121 in words is "ten billion, one hundred twenty million, six hundred sixty-six thousand, one hundred twenty-one".