21412520413441 has 4 divisors (see below), whose sum is σ = 21413140220500. Its totient is φ = 21411900606384.

The previous prime is 21412520413399. The next prime is 21412520413463. The reversal of 21412520413441 is 14431402521412.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 11818193817600 + 9594326595841 = 3437760^2 + 3097471^2 .

It is a cyclic number.

It is not a de Polignac number, because 21412520413441 - 2⁷ = 21412520413313 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21412520413397 and 21412520413406.

It is not an unprimeable number, because it can be changed into a prime (21412520413241) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 309851706 + ... + 309920803.

It is an arithmetic number, because the mean of its divisors is an integer number (5353285055125).

Almost surely, 2^{21412520413441} is an apocalyptic number.

It is an amenable number.

21412520413441 is a deficient number, since it is larger than the sum of its proper divisors (619807059).

21412520413441 is an equidigital number, since it uses as much as digits as its factorization.

21412520413441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 619807058.

The product of its (nonzero) digits is 30720, while the sum is 34.

Adding to 21412520413441 its reverse (14431402521412), we get a palindrome (35843922934853).

The spelling of 21412520413441 in words is "twenty-one trillion, four hundred twelve billion, five hundred twenty million, four hundred thirteen thousand, four hundred forty-one".