21448143908 has 24 divisors (see below), whose sum is σ = 41470071552. Its totient is φ = 9654406784.

The previous prime is 21448143887. The next prime is 21448143949. The reversal of 21448143908 is 80934184412.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6855260 + ... + 6858387.

It is an arithmetic number, because the mean of its divisors is an integer number (1727919648).

Almost surely, 2^21448143908 is an apocalyptic number.

It is an amenable number.

21448143908 is a deficient number, since it is larger than the sum of its proper divisors (20021927644).

21448143908 is a wasteful number, since it uses less digits than its factorization.

21448143908 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13713691 (or 13713689 counting only the distinct ones).

The product of its (nonzero) digits is 221184, while the sum is 44.

The spelling of 21448143908 in words is "twenty-one billion, four hundred forty-eight million, one hundred forty-three thousand, nine hundred eight".