21748052761 has 2 divisors, whose sum is σ = 21748052762. Its totient is φ = 21748052760.

The previous prime is 21748052747. The next prime is 21748052773. The reversal of 21748052761 is 16725084712.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12197877136 + 9550175625 = 110444^2 + 97725^2 .

It is a cyclic number.

It is not a de Polignac number, because 21748052761 - 2¹³ = 21748044569 is a prime.

It is not a weakly prime, because it can be changed into another prime (21748050761) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10874026380 + 10874026381.

It is an arithmetic number, because the mean of its divisors is an integer number (10874026381).

Almost surely, 2^21748052761 is an apocalyptic number.

It is an amenable number.

21748052761 is a deficient number, since it is larger than the sum of its proper divisors (1).

21748052761 is an equidigital number, since it uses as much as digits as its factorization.

21748052761 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 188160, while the sum is 43.

The spelling of 21748052761 in words is "twenty-one billion, seven hundred forty-eight million, fifty-two thousand, seven hundred sixty-one".