21135641204323 has 8 divisors (see below), whose sum is σ = 22855061328192. Its totient is φ = 19469126315136.

The previous prime is 21135641204291. The next prime is 21135641204341. The reversal of 21135641204323 is 32340214653112.

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

It is a cyclic number.

It is not a de Polignac number, because 21135641204323 - 2⁵ = 21135641204291 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21135641204023) 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, 13226307840 + ... + 13226309437.

It is an arithmetic number, because the mean of its divisors is an integer number (2856882666024).

Almost surely, 2^{21135641204323} is an apocalyptic number.

21135641204323 is a deficient number, since it is larger than the sum of its proper divisors (1719420123869).

21135641204323 is a wasteful number, since it uses less digits than its factorization.

21135641204323 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26452617341.

The product of its (nonzero) digits is 103680, while the sum is 37.

Adding to 21135641204323 its reverse (32340214653112), we get a palindrome (53475855857435).

The spelling of 21135641204323 in words is "twenty-one trillion, one hundred thirty-five billion, six hundred forty-one million, two hundred four thousand, three hundred twenty-three".