12521042554 has 4 divisors (see below), whose sum is σ = 18781563834. Its totient is φ = 6260521276.

The previous prime is 12521042551. The next prime is 12521042647. The reversal of 12521042554 is 45524012521.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 11411153329 + 1109889225 = 106823^2 + 33315^2 .

It is not an unprimeable number, because it can be changed into a prime (12521042551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3130260637 + ... + 3130260640.

Almost surely, 2^12521042554 is an apocalyptic number.

12521042554 is a deficient number, since it is larger than the sum of its proper divisors (6260521280).

12521042554 is an equidigital number, since it uses as much as digits as its factorization.

12521042554 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6260521279.

The product of its (nonzero) digits is 16000, while the sum is 31.

The spelling of 12521042554 in words is "twelve billion, five hundred twenty-one million, forty-two thousand, five hundred fifty-four".