104203212521 has 4 divisors (see below), whose sum is σ = 104216961792. Its totient is φ = 104189463252.

The previous prime is 104203212479. The next prime is 104203212569. The reversal of 104203212521 is 125212302401.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-104203212521 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (104203812521) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6863261 + ... + 6878426.

It is an arithmetic number, because the mean of its divisors is an integer number (26054240448).

Almost surely, 2^104203212521 is an apocalyptic number.

It is an amenable number.

104203212521 is a deficient number, since it is larger than the sum of its proper divisors (13749271).

104203212521 is an equidigital number, since it uses as much as digits as its factorization.

104203212521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13749270.

The product of its (nonzero) digits is 960, while the sum is 23.

Adding to 104203212521 its reverse (125212302401), we get a palindrome (229415514922).

The spelling of 104203212521 in words is "one hundred four billion, two hundred three million, two hundred twelve thousand, five hundred twenty-one".