21540324377243 has 8 divisors (see below), whose sum is σ = 24618343549920. Its totient is φ = 18462512698560.

The previous prime is 21540324377239. The next prime is 21540324377287. The reversal of 21540324377243 is 34277342304512.

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

It is not a de Polignac number, because 21540324377243 - 2² = 21540324377239 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21540324377203) 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 7 ways as a sum of consecutive naturals, for example, 51650978 + ... + 52066343.

It is an arithmetic number, because the mean of its divisors is an integer number (3077292943740).

Almost surely, 2^{21540324377243} is an apocalyptic number.

21540324377243 is a deficient number, since it is larger than the sum of its proper divisors (3078019172677).

21540324377243 is a wasteful number, since it uses less digits than its factorization.

21540324377243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103746997.

The product of its (nonzero) digits is 3386880, while the sum is 47.

The spelling of 21540324377243 in words is "twenty-one trillion, five hundred forty billion, three hundred twenty-four million, three hundred seventy-seven thousand, two hundred forty-three".