12101681 has 4 divisors (see below), whose sum is σ = 12112164. Its totient is φ = 12091200.

The previous prime is 12101669. The next prime is 12101693. The reversal of 12101681 is 18610121.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is an interprime number because it is at equal distance from previous prime (12101669) and next prime (12101693).

It can be written as a sum of positive squares in 2 ways, for example, as 8065600 + 4036081 = 2840^2 + 2009^2 .

It is a cyclic number.

It is not a de Polignac number, because 12101681 - 2¹⁰ = 12100657 is a prime.

It is a super-2 number, since 2×12101681² = 292901366051522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12101641) 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, 3260 + ... + 5901.

It is an arithmetic number, because the mean of its divisors is an integer number (3028041).

Almost surely, 2^12101681 is an apocalyptic number.

It is an amenable number.

12101681 is a deficient number, since it is larger than the sum of its proper divisors (10483).

12101681 is an equidigital number, since it uses as much as digits as its factorization.

12101681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10482.

The product of its (nonzero) digits is 96, while the sum is 20.

The square root of 12101681 is about 3478.7470445550. The cubic root of 12101681 is about 229.5876733519.

The spelling of 12101681 in words is "twelve million, one hundred one thousand, six hundred eighty-one".