21225061035405 has 24 divisors (see below), whose sum is σ = 36873910170240. Its totient is φ = 11294246590560.

The previous prime is 21225061035379. The next prime is 21225061035421. The reversal of 21225061035405 is 50453016052212.

21225061035405 is a `hidden beast` number, since 2 + 1 + 2 + 2 + 5 + 0 + 6 + 103 + 540 + 5 = 666.

It is not a de Polignac number, because 21225061035405 - 2¹¹ = 21225061033357 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21225061035405.

It is a congruent number.

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 in 23 ways as a sum of consecutive naturals, for example, 537187561 + ... + 537227070.

It is an arithmetic number, because the mean of its divisors is an integer number (1536412923760).

Almost surely, 2^{21225061035405} is an apocalyptic number.

It is an amenable number.

21225061035405 is a deficient number, since it is larger than the sum of its proper divisors (15648849134835).

21225061035405 is a wasteful number, since it uses less digits than its factorization.

21225061035405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1074415081 (or 1074415078 counting only the distinct ones).

The product of its (nonzero) digits is 72000, while the sum is 36.

Adding to 21225061035405 its reverse (50453016052212), we get a palindrome (71678077087617).

The spelling of 21225061035405 in words is "twenty-one trillion, two hundred twenty-five billion, sixty-one million, thirty-five thousand, four hundred five".