125242242521 has 4 divisors (see below), whose sum is σ = 136627900944. Its totient is φ = 113856584100.

The previous prime is 125242242511. The next prime is 125242242569.

125242242521 is nontrivially palindromic in base 10.

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-125242242521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (125242242511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5692829195 + ... + 5692829216.

It is an arithmetic number, because the mean of its divisors is an integer number (34156975236).

Almost surely, 2^125242242521 is an apocalyptic number.

125242242521 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

125242242521 is a deficient number, since it is larger than the sum of its proper divisors (11385658423).

125242242521 is a wasteful number, since it uses less digits than its factorization.

125242242521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11385658422.

The product of its digits is 25600, while the sum is 32.

It can be divided in two parts, 125242 and 242521, that added together give a palindrome (367763).

The spelling of 125242242521 in words is "one hundred twenty-five billion, two hundred forty-two million, two hundred forty-two thousand, five hundred twenty-one".