21448372825 has 12 divisors (see below), whose sum is σ = 29013799248. Its totient is φ = 15598816400.

The previous prime is 21448372807. The next prime is 21448372859. The reversal of 21448372825 is 52827384412.

It is not a de Polignac number, because 21448372825 - 2⁵ = 21448372793 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 38996767 + ... + 38997316.

It is an arithmetic number, because the mean of its divisors is an integer number (2417816604).

Almost surely, 2^21448372825 is an apocalyptic number.

21448372825 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21448372825 is a deficient number, since it is larger than the sum of its proper divisors (7565426423).

21448372825 is a wasteful number, since it uses less digits than its factorization.

21448372825 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77994104 (or 77994099 counting only the distinct ones).

The product of its digits is 860160, while the sum is 46.

The spelling of 21448372825 in words is "twenty-one billion, four hundred forty-eight million, three hundred seventy-two thousand, eight hundred twenty-five".