21354625144 has 16 divisors (see below), whose sum is σ = 40207456800. Its totient is φ = 10632636672.

The previous prime is 21354625121. The next prime is 21354625151. The reversal of 21354625144 is 44152645312.

It is a congruent 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 3 ways as a sum of consecutive naturals, for example, 5582457 + ... + 5586280.

It is an arithmetic number, because the mean of its divisors is an integer number (2512966050).

Almost surely, 2^21354625144 is an apocalyptic number.

It is an amenable number.

21354625144 is a deficient number, since it is larger than the sum of its proper divisors (18852831656).

21354625144 is a wasteful number, since it uses less digits than its factorization.

21354625144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11168982 (or 11168978 counting only the distinct ones).

The product of its digits is 115200, while the sum is 37.

The spelling of 21354625144 in words is "twenty-one billion, three hundred fifty-four million, six hundred twenty-five thousand, one hundred forty-four".