12454626721 has 12 divisors (see below), whose sum is σ = 13041927612. Its totient is φ = 11889304128.

The previous prime is 12454626697. The next prime is 12454626731. The reversal of 12454626721 is 12762645421.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 3637416721 + 8817210000 = 60311^2 + 93900^2 .

It is not a de Polignac number, because 12454626721 - 2⁵ = 12454626689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12454626731) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13270 + ... + 158383.

It is an arithmetic number, because the mean of its divisors is an integer number (1086827301).

Almost surely, 2^12454626721 is an apocalyptic number.

It is an amenable number.

12454626721 is a deficient number, since it is larger than the sum of its proper divisors (587300891).

12454626721 is an equidigital number, since it uses as much as digits as its factorization.

12454626721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 171780 (or 171743 counting only the distinct ones).

The product of its digits is 161280, while the sum is 40.

The spelling of 12454626721 in words is "twelve billion, four hundred fifty-four million, six hundred twenty-six thousand, seven hundred twenty-one".