21748445603 has 2 divisors, whose sum is σ = 21748445604. Its totient is φ = 21748445602.

The previous prime is 21748445519. The next prime is 21748445611. The reversal of 21748445603 is 30654484712.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21748445603 - 2¹⁶ = 21748380067 is a prime.

It is a super-2 number, since 2×21748445603² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21748345603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10874222801 + 10874222802.

It is an arithmetic number, because the mean of its divisors is an integer number (10874222802).

Almost surely, 2^21748445603 is an apocalyptic number.

21748445603 is a deficient number, since it is larger than the sum of its proper divisors (1).

21748445603 is an equidigital number, since it uses as much as digits as its factorization.

21748445603 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 645120, while the sum is 44.

The spelling of 21748445603 in words is "twenty-one billion, seven hundred forty-eight million, four hundred forty-five thousand, six hundred three".