21515451324341 has 8 divisors (see below), whose sum is σ = 23171254690584. Its totient is φ = 19859757765120.

The previous prime is 21515451324331. The next prime is 21515451324397. The reversal of 21515451324341 is 14342315451512.

It can be written as a sum of positive squares in 4 ways, for example, as 7897949088241 + 13617502236100 = 2810329^2 + 3690190^2 .

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

It is not a de Polignac number, because 21515451324341 - 2²⁶ = 21515384215477 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21515451324331) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27044576 + ... + 27828761.

It is an arithmetic number, because the mean of its divisors is an integer number (2896406836323).

Almost surely, 2^{21515451324341} is an apocalyptic number.

It is an amenable number.

21515451324341 is a deficient number, since it is larger than the sum of its proper divisors (1655803366243).

21515451324341 is a wasteful number, since it uses less digits than its factorization.

21515451324341 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54903511.

The product of its digits is 288000, while the sum is 41.

Adding to 21515451324341 its reverse (14342315451512), we get a palindrome (35857766775853).

The spelling of 21515451324341 in words is "twenty-one trillion, five hundred fifteen billion, four hundred fifty-one million, three hundred twenty-four thousand, three hundred forty-one".