12268757621 has 4 divisors (see below), whose sum is σ = 12346902732. Its totient is φ = 12190612512.

The previous prime is 12268757609. The next prime is 12268757651. The reversal of 12268757621 is 12675786221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12675786221 = 7 ⋅1810826603.

It can be written as a sum of positive squares in 2 ways, for example, as 2515022500 + 9753735121 = 50150^2 + 98761^2 .

It is a cyclic number.

It is not a de Polignac number, because 12268757621 - 2¹⁰ = 12268756597 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 (12268757651) 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, 39072320 + ... + 39072633.

It is an arithmetic number, because the mean of its divisors is an integer number (3086725683).

Almost surely, 2^12268757621 is an apocalyptic number.

It is an amenable number.

12268757621 is a deficient number, since it is larger than the sum of its proper divisors (78145111).

12268757621 is an equidigital number, since it uses as much as digits as its factorization.

12268757621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78145110.

The product of its digits is 564480, while the sum is 47.

The spelling of 12268757621 in words is "twelve billion, two hundred sixty-eight million, seven hundred fifty-seven thousand, six hundred twenty-one".