21375061556104 has 8 divisors (see below), whose sum is σ = 40078240417710. Its totient is φ = 10687530778048.

The previous prime is 21375061556081. The next prime is 21375061556129. The reversal of 21375061556104 is 40165516057312.

It can be written as a sum of positive squares in only one way, i.e., 13305496428900 + 8069565127204 = 3647670^2 + 2840698^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

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, 1335941347249 + ... + 1335941347264.

Almost surely, 2^{21375061556104} is an apocalyptic number.

It is an amenable number.

21375061556104 is a deficient number, since it is larger than the sum of its proper divisors (18703178861606).

21375061556104 is a wasteful number, since it uses less digits than its factorization.

21375061556104 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2671882694519 (or 2671882694515 counting only the distinct ones).

The product of its (nonzero) digits is 756000, while the sum is 46.

The spelling of 21375061556104 in words is "twenty-one trillion, three hundred seventy-five billion, sixty-one million, five hundred fifty-six thousand, one hundred four".