12129662401 has 4 divisors (see below), whose sum is σ = 12843171972. Its totient is φ = 11416152832.

The previous prime is 12129662399. The next prime is 12129662437. The reversal of 12129662401 is 10426692121.

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 10100250000 + 2029412401 = 100500^2 + 45049^2 .

It is a cyclic number.

It is not a de Polignac number, because 12129662401 - 2¹ = 12129662399 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12129662201) 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, 356754760 + ... + 356754793.

It is an arithmetic number, because the mean of its divisors is an integer number (3210792993).

Almost surely, 2^12129662401 is an apocalyptic number.

It is an amenable number.

12129662401 is a deficient number, since it is larger than the sum of its proper divisors (713509571).

12129662401 is an equidigital number, since it uses as much as digits as its factorization.

12129662401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 713509570.

The product of its (nonzero) digits is 10368, while the sum is 34.

The spelling of 12129662401 in words is "twelve billion, one hundred twenty-nine million, six hundred sixty-two thousand, four hundred one".