21450205233405 has 96 divisors (see below), whose sum is σ = 40318022384640. Its totient is φ = 10486996508160.

The previous prime is 21450205233397. The next prime is 21450205233493. The reversal of 21450205233405 is 50433250205412.

21450205233405 is a `hidden beast` number, since 2 + 1 + 45 + 0 + 205 + 2 + 3 + 3 + 405 = 666.

It is not a de Polignac number, because 21450205233405 - 2³ = 21450205233397 is a prime.

It is a super-2 number, since 2×21450205233405² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21450205233405.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 104333260 + ... + 104538650.

It is an arithmetic number, because the mean of its divisors is an integer number (419979399840).

Almost surely, 2^{21450205233405} is an apocalyptic number.

It is an amenable number.

21450205233405 is a deficient number, since it is larger than the sum of its proper divisors (18867817151235).

21450205233405 is a wasteful number, since it uses less digits than its factorization.

21450205233405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 206651 (or 206648 counting only the distinct ones).

The product of its (nonzero) digits is 144000, while the sum is 36.

Adding to 21450205233405 its reverse (50433250205412), we get a palindrome (71883455438817).

The spelling of 21450205233405 in words is "twenty-one trillion, four hundred fifty billion, two hundred five million, two hundred thirty-three thousand, four hundred five".