21646451230245 has 96 divisors (see below), whose sum is σ = 41136933801600. Its totient is φ = 10889391147264.

The previous prime is 21646451230241. The next prime is 21646451230273. The reversal of 21646451230245 is 54203215464612.

It is a happy number.

21646451230245 is a `hidden beast` number, since 2 + 1 + 6 + 4 + 64 + 512 + 30 + 2 + 45 = 666.

It is not a de Polignac number, because 21646451230245 - 2² = 21646451230241 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 21646451230245.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21646451230241) by changing a digit.

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 95 ways as a sum of consecutive naturals, for example, 3239119 + ... + 7333811.

It is an arithmetic number, because the mean of its divisors is an integer number (428509727100).

Almost surely, 2^{21646451230245} is an apocalyptic number.

It is an amenable number.

21646451230245 is a deficient number, since it is larger than the sum of its proper divisors (19490482571355).

21646451230245 is a wasteful number, since it uses less digits than its factorization.

21646451230245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4094961 (or 4094949 counting only the distinct ones).

The product of its (nonzero) digits is 1382400, while the sum is 45.

Adding to 21646451230245 its reverse (54203215464612), we get a palindrome (75849666694857).

The spelling of 21646451230245 in words is "twenty-one trillion, six hundred forty-six billion, four hundred fifty-one million, two hundred thirty thousand, two hundred forty-five".