18448125021 has 6 divisors (see below), whose sum is σ = 26647291710. Its totient is φ = 12298750008.

The previous prime is 18448124987. The next prime is 18448125041. The reversal of 18448125021 is 12052184481.

It can be written as a sum of positive squares in only one way, i.e., 15471876996 + 2976248025 = 124386^2 + 54555^2 .

It is not a de Polignac number, because 18448125021 - 2²¹ = 18446027869 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18448125041) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1024895826 + ... + 1024895843.

It is an arithmetic number, because the mean of its divisors is an integer number (4441215285).

Almost surely, 2^18448125021 is an apocalyptic number.

It is an amenable number.

18448125021 is a deficient number, since it is larger than the sum of its proper divisors (8199166689).

18448125021 is a wasteful number, since it uses less digits than its factorization.

18448125021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2049791675 (or 2049791672 counting only the distinct ones).

The product of its (nonzero) digits is 20480, while the sum is 36.

The spelling of 18448125021 in words is "eighteen billion, four hundred forty-eight million, one hundred twenty-five thousand, twenty-one".