21324542054415 has 32 divisors (see below), whose sum is σ = 34952257916352. Its totient is φ = 11095438464000.

The previous prime is 21324542054383. The next prime is 21324542054419. The reversal of 21324542054415 is 51445024542312.

It is not a de Polignac number, because 21324542054415 - 2⁵ = 21324542054383 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21324542054419) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 27627025 + ... + 28388405.

It is an arithmetic number, because the mean of its divisors is an integer number (1092258059886).

Almost surely, 2^{21324542054415} is an apocalyptic number.

21324542054415 is a deficient number, since it is larger than the sum of its proper divisors (13627715861937).

21324542054415 is a wasteful number, since it uses less digits than its factorization.

21324542054415 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 806971.

The product of its (nonzero) digits is 768000, while the sum is 42.

Adding to 21324542054415 its reverse (51445024542312), we get a palindrome (72769566596727).

The spelling of 21324542054415 in words is "twenty-one trillion, three hundred twenty-four billion, five hundred forty-two million, fifty-four thousand, four hundred fifteen".