21545331043343 has 4 divisors (see below), whose sum is σ = 21545377150080. Its totient is φ = 21545284936608.

The previous prime is 21545331043303. The next prime is 21545331043351. The reversal of 21545331043343 is 34334013354512.

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

It is a cyclic number.

It is not a de Polignac number, because 21545331043343 - 2⁶ = 21545331043279 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21545331043343.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21545331043303) 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 3 ways as a sum of consecutive naturals, for example, 22345178 + ... + 23289431.

It is an arithmetic number, because the mean of its divisors is an integer number (5386344287520).

Almost surely, 2^{21545331043343} is an apocalyptic number.

21545331043343 is a deficient number, since it is larger than the sum of its proper divisors (46106737).

21545331043343 is an equidigital number, since it uses as much as digits as its factorization.

21545331043343 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46106736.

The product of its (nonzero) digits is 777600, while the sum is 41.

Adding to 21545331043343 its reverse (34334013354512), we get a palindrome (55879344397855).

The spelling of 21545331043343 in words is "twenty-one trillion, five hundred forty-five billion, three hundred thirty-one million, forty-three thousand, three hundred forty-three".