21745701144347 has 4 divisors (see below), whose sum is σ = 21990034865160. Its totient is φ = 21501367423536.

The previous prime is 21745701144311. The next prime is 21745701144373. The reversal of 21745701144347 is 74344110754712.

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 21745701144347 - 2¹⁸ = 21745700882203 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21745701144295 and 21745701144304.

It is not an unprimeable number, because it can be changed into a prime (21745701144047) 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, 122166860273 + ... + 122166860450.

It is an arithmetic number, because the mean of its divisors is an integer number (5497508716290).

Almost surely, 2^{21745701144347} is an apocalyptic number.

21745701144347 is a deficient number, since it is larger than the sum of its proper divisors (244333720813).

21745701144347 is an equidigital number, since it uses as much as digits as its factorization.

21745701144347 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 244333720812.

The product of its (nonzero) digits is 2634240, while the sum is 50.

The spelling of 21745701144347 in words is "twenty-one trillion, seven hundred forty-five billion, seven hundred one million, one hundred forty-four thousand, three hundred forty-seven".