21540324377193 has 16 divisors (see below), whose sum is σ = 29337536520576. Its totient is φ = 14054616894080.

The previous prime is 21540324377189. The next prime is 21540324377203. The reversal of 21540324377193 is 39177342304512.

It is a cyclic number.

It is not a de Polignac number, because 21540324377193 - 2² = 21540324377189 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21540324377123) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 369052146 + ... + 369110507.

It is an arithmetic number, because the mean of its divisors is an integer number (1833596032536).

Almost surely, 2^{21540324377193} is an apocalyptic number.

It is an amenable number.

21540324377193 is a deficient number, since it is larger than the sum of its proper divisors (7797212143383).

21540324377193 is a wasteful number, since it uses less digits than its factorization.

21540324377193 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 738162864.

The product of its (nonzero) digits is 3810240, while the sum is 51.

The spelling of 21540324377193 in words is "twenty-one trillion, five hundred forty billion, three hundred twenty-four million, three hundred seventy-seven thousand, one hundred ninety-three".