21404626250205 has 96 divisors (see below), whose sum is σ = 37799384482944. Its totient is φ = 10335207168000.

The previous prime is 21404626250201. The next prime is 21404626250207. The reversal of 21404626250205 is 50205262640412.

It is not a de Polignac number, because 21404626250205 - 2² = 21404626250201 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21404626250201) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 432121290 + ... + 432170820.

It is an arithmetic number, because the mean of its divisors is an integer number (393743588364).

Almost surely, 2^{21404626250205} is an apocalyptic number.

It is an amenable number.

21404626250205 is a deficient number, since it is larger than the sum of its proper divisors (16394758232739).

21404626250205 is a wasteful number, since it uses less digits than its factorization.

21404626250205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50539 (or 50528 counting only the distinct ones).

The product of its (nonzero) digits is 230400, while the sum is 39.

Adding to 21404626250205 its reverse (50205262640412), we get a palindrome (71609888890617).

The spelling of 21404626250205 in words is "twenty-one trillion, four hundred four billion, six hundred twenty-six million, two hundred fifty thousand, two hundred five".