21749170601 has 2 divisors, whose sum is σ = 21749170602. Its totient is φ = 21749170600.

The previous prime is 21749170501. The next prime is 21749170613. The reversal of 21749170601 is 10607194712.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21749170576 + 25 = 147476^2 + 5^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21749170601 is a prime.

It is not a weakly prime, because it can be changed into another prime (21749170301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10874585300 + 10874585301.

It is an arithmetic number, because the mean of its divisors is an integer number (10874585301).

Almost surely, 2^21749170601 is an apocalyptic number.

It is an amenable number.

21749170601 is a deficient number, since it is larger than the sum of its proper divisors (1).

21749170601 is an equidigital number, since it uses as much as digits as its factorization.

21749170601 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 21168, while the sum is 38.

The spelling of 21749170601 in words is "twenty-one billion, seven hundred forty-nine million, one hundred seventy thousand, six hundred one".