12291212621 has 4 divisors (see below), whose sum is σ = 12291485472. Its totient is φ = 12290939772.

The previous prime is 12291212611. The next prime is 12291212639. The reversal of 12291212621 is 12621219221.

12291212621 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12291212621 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12291212611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 51041 + ... + 164886.

It is an arithmetic number, because the mean of its divisors is an integer number (3072871368).

Almost surely, 2^12291212621 is an apocalyptic number.

It is an amenable number.

12291212621 is a deficient number, since it is larger than the sum of its proper divisors (272851).

12291212621 is an equidigital number, since it uses as much as digits as its factorization.

12291212621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 272850.

The product of its digits is 1728, while the sum is 29.

The spelling of 12291212621 in words is "twelve billion, two hundred ninety-one million, two hundred twelve thousand, six hundred twenty-one".