21123042204104 has 8 divisors (see below), whose sum is σ = 39605704132710. Its totient is φ = 10561521102048.

The previous prime is 21123042204073. The next prime is 21123042204119. The reversal of 21123042204104 is 40140224032112.

It can be written as a sum of positive squares in only one way, i.e., 11935656859204 + 9187385344900 = 3454802^2 + 3031070^2 .

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, 1320190137749 + ... + 1320190137764.

Almost surely, 2^{21123042204104} is an apocalyptic number.

It is an amenable number.

21123042204104 is a deficient number, since it is larger than the sum of its proper divisors (18482661928606).

21123042204104 is a wasteful number, since it uses less digits than its factorization.

21123042204104 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2640380275519 (or 2640380275515 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 26.

Adding to 21123042204104 its reverse (40140224032112), we get a palindrome (61263266236216).

The spelling of 21123042204104 in words is "twenty-one trillion, one hundred twenty-three billion, forty-two million, two hundred four thousand, one hundred four".