21845874329663 has 4 divisors (see below), whose sum is σ = 21845893475688. Its totient is φ = 21845855183640.

The previous prime is 21845874329579. The next prime is 21845874329707. The reversal of 21845874329663 is 36692347854812.

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 21845874329663 - 2¹² = 21845874325567 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21845874329593 and 21845874329602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21845874319663) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7745156 + ... + 10182297.

It is an arithmetic number, because the mean of its divisors is an integer number (5461473368922).

Almost surely, 2^{21845874329663} is an apocalyptic number.

21845874329663 is a deficient number, since it is larger than the sum of its proper divisors (19146025).

21845874329663 is a wasteful number, since it uses less digits than its factorization.

21845874329663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19146024.

The product of its digits is 418037760, while the sum is 68.

The spelling of 21845874329663 in words is "twenty-one trillion, eight hundred forty-five billion, eight hundred seventy-four million, three hundred twenty-nine thousand, six hundred sixty-three".