21542502134343 has 8 divisors (see below), whose sum is σ = 28727259625456. Its totient is φ = 14359706366400.

The previous prime is 21542502134323. The next prime is 21542502134431. The reversal of 21542502134343 is 34343120524512.

It is a happy number.

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

It is a de Polignac number, because none of the positive numbers 2^k-21542502134343 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21542502134323) 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, 490405168 + ... + 490449093.

It is an arithmetic number, because the mean of its divisors is an integer number (3590907453182).

Almost surely, 2^{21542502134343} is an apocalyptic number.

21542502134343 is a deficient number, since it is larger than the sum of its proper divisors (7184757491113).

21542502134343 is an equidigital number, since it uses as much as digits as its factorization.

21542502134343 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 980861585.

The product of its (nonzero) digits is 345600, while the sum is 39.

Adding to 21542502134343 its reverse (34343120524512), we get a palindrome (55885622658855).

The spelling of 21542502134343 in words is "twenty-one trillion, five hundred forty-two billion, five hundred two million, one hundred thirty-four thousand, three hundred forty-three".