21416405124545 has 8 divisors (see below), whose sum is σ = 26051736645096. Its totient is φ = 16898423769216.

The previous prime is 21416405124523. The next prime is 21416405124599. The reversal of 21416405124545 is 54542150461412.

It can be written as a sum of positive squares in 4 ways, for example, as 4485805392784 + 16930599731761 = 2117972^2 + 4114681^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21416405124545 - 2⁶ = 21416405124481 is a prime.

It is a super-2 number, since 2×21416405124545² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21416405124496 and 21416405124505.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29337540902 + ... + 29337541631.

It is an arithmetic number, because the mean of its divisors is an integer number (3256467080637).

Almost surely, 2^{21416405124545} is an apocalyptic number.

It is an amenable number.

21416405124545 is a deficient number, since it is larger than the sum of its proper divisors (4635331520551).

21416405124545 is an equidigital number, since it uses as much as digits as its factorization.

21416405124545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58675082611.

The product of its (nonzero) digits is 768000, while the sum is 44.

Adding to 21416405124545 its reverse (54542150461412), we get a palindrome (75958555585957).

The spelling of 21416405124545 in words is "twenty-one trillion, four hundred sixteen billion, four hundred five million, one hundred twenty-four thousand, five hundred forty-five".