12145521401 has 4 divisors (see below), whose sum is σ = 13079792292. Its totient is φ = 11211250512.

The previous prime is 12145521379. The next prime is 12145521419. The reversal of 12145521401 is 10412554121.

It is a happy number.

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 1540641001 + 10604880400 = 39251^2 + 102980^2 .

It is a cyclic number.

It is not a de Polignac number, because 12145521401 - 2¹⁴ = 12145505017 is a prime.

It is a super-3 number, since 3×12145521401³ (a number of 31 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12145521901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 467135426 + ... + 467135451.

It is an arithmetic number, because the mean of its divisors is an integer number (3269948073).

Almost surely, 2^12145521401 is an apocalyptic number.

It is an amenable number.

12145521401 is a deficient number, since it is larger than the sum of its proper divisors (934270891).

12145521401 is an equidigital number, since it uses as much as digits as its factorization.

12145521401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 934270890.

The product of its (nonzero) digits is 1600, while the sum is 26.

The spelling of 12145521401 in words is "twelve billion, one hundred forty-five million, five hundred twenty-one thousand, four hundred one".