21601384847428 has 24 divisors (see below), whose sum is σ = 38613742699392. Its totient is φ = 10568970413664.

The previous prime is 21601384847377. The next prime is 21601384847429. The reversal of 21601384847428 is 82474848310612.

It is not an unprimeable number, because it can be changed into a prime (21601384847429) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9396951 + ... + 11467582.

It is an arithmetic number, because the mean of its divisors is an integer number (1608905945808).

Almost surely, 2^{21601384847428} is an apocalyptic number.

It is an amenable number.

21601384847428 is a deficient number, since it is larger than the sum of its proper divisors (17012357851964).

21601384847428 is a wasteful number, since it uses less digits than its factorization.

21601384847428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20870091 (or 20870089 counting only the distinct ones).

The product of its (nonzero) digits is 16515072, while the sum is 58.

The spelling of 21601384847428 in words is "twenty-one trillion, six hundred one billion, three hundred eighty-four million, eight hundred forty-seven thousand, four hundred twenty-eight".