21879158884048 has 10 divisors (see below), whose sum is σ = 42390870337874. Its totient is φ = 10939579442016.

The previous prime is 21879158884043. The next prime is 21879158884049. The reversal of 21879158884048 is 84048885197812.

It can be written as a sum of positive squares in only one way, i.e., 16887562864704 + 4991596019344 = 4109448^2 + 2234188^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21879158884043) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 683723715111 + ... + 683723715142.

Almost surely, 2^{21879158884048} is an apocalyptic number.

It is an amenable number.

21879158884048 is a deficient number, since it is larger than the sum of its proper divisors (20511711453826).

21879158884048 is a wasteful number, since it uses less digits than its factorization.

21879158884048 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1367447430261 (or 1367447430255 counting only the distinct ones).

The product of its (nonzero) digits is 330301440, while the sum is 73.

The spelling of 21879158884048 in words is "twenty-one trillion, eight hundred seventy-nine billion, one hundred fifty-eight million, eight hundred eighty-four thousand, forty-eight".