21764127241 has 2 divisors, whose sum is σ = 21764127242. Its totient is φ = 21764127240.

The previous prime is 21764127221. The next prime is 21764127271. The reversal of 21764127241 is 14272146712.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13758351616 + 8005775625 = 117296^2 + 89475^2 .

It is a cyclic number.

It is not a de Polignac number, because 21764127241 - 2³¹ = 19616643593 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21764127241.

It is not a weakly prime, because it can be changed into another prime (21764127221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10882063620 + 10882063621.

It is an arithmetic number, because the mean of its divisors is an integer number (10882063621).

Almost surely, 2^21764127241 is an apocalyptic number.

It is an amenable number.

21764127241 is a deficient number, since it is larger than the sum of its proper divisors (1).

21764127241 is an equidigital number, since it uses as much as digits as its factorization.

21764127241 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 37632, while the sum is 37.

The spelling of 21764127241 in words is "twenty-one billion, seven hundred sixty-four million, one hundred twenty-seven thousand, two hundred forty-one".