12165221901 has 16 divisors (see below), whose sum is σ = 18541582848. Its totient is φ = 6950017200.

The previous prime is 12165221843. The next prime is 12165221909. The reversal of 12165221901 is 10912256121.

It is not a de Polignac number, because 12165221901 - 2⁹ = 12165221389 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12165221909) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 36766 + ... + 160256.

It is an arithmetic number, because the mean of its divisors is an integer number (1158848928).

Almost surely, 2^12165221901 is an apocalyptic number.

It is an amenable number.

12165221901 is a deficient number, since it is larger than the sum of its proper divisors (6376360947).

12165221901 is a wasteful number, since it uses less digits than its factorization.

12165221901 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128192.

The product of its (nonzero) digits is 2160, while the sum is 30.

The spelling of 12165221901 in words is "twelve billion, one hundred sixty-five million, two hundred twenty-one thousand, nine hundred one".