12034321581 has 4 divisors (see below), whose sum is σ = 16045762112. Its totient is φ = 8022881052.

The previous prime is 12034321547. The next prime is 12034321583. The reversal of 12034321581 is 18512343021.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 12034321581 - 2²¹ = 12032224429 is a prime.

It is a super-2 number, since 2×12034321581² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12034321583) 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, 2005720261 + ... + 2005720266.

It is an arithmetic number, because the mean of its divisors is an integer number (4011440528).

Almost surely, 2^12034321581 is an apocalyptic number.

It is an amenable number.

12034321581 is a deficient number, since it is larger than the sum of its proper divisors (4011440531).

12034321581 is an equidigital number, since it uses as much as digits as its factorization.

12034321581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4011440530.

The product of its (nonzero) digits is 5760, while the sum is 30.

The spelling of 12034321581 in words is "twelve billion, thirty-four million, three hundred twenty-one thousand, five hundred eighty-one".