21548612924 has 12 divisors (see below), whose sum is σ = 37715864424. Its totient is φ = 10772651664.

The previous prime is 21548612923. The next prime is 21548612971. The reversal of 21548612924 is 42921684512.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21548612923) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 384167 + ... + 436670.

It is an arithmetic number, because the mean of its divisors is an integer number (3142988702).

Almost surely, 2^21548612924 is an apocalyptic number.

It is an amenable number.

21548612924 is a deficient number, since it is larger than the sum of its proper divisors (16167251500).

21548612924 is a wasteful number, since it uses less digits than its factorization.

21548612924 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 827404 (or 827402 counting only the distinct ones).

The product of its digits is 276480, while the sum is 44.

The spelling of 21548612924 in words is "twenty-one billion, five hundred forty-eight million, six hundred twelve thousand, nine hundred twenty-four".