21480874409 has 2 divisors, whose sum is σ = 21480874410. Its totient is φ = 21480874408.

The previous prime is 21480874381. The next prime is 21480874411. The reversal of 21480874409 is 90447808412.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16300905625 + 5179968784 = 127675^2 + 71972^2 .

It is a cyclic number.

It is not a de Polignac number, because 21480874409 - 2⁸ = 21480874153 is a prime.

It is a super-2 number, since 2×21480874409² (a number of 21 digits) contains 22 as substring.

Together with 21480874411, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (21480874309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10740437204 + 10740437205.

It is an arithmetic number, because the mean of its divisors is an integer number (10740437205).

Almost surely, 2^21480874409 is an apocalyptic number.

It is an amenable number.

21480874409 is a deficient number, since it is larger than the sum of its proper divisors (1).

21480874409 is an equidigital number, since it uses as much as digits as its factorization.

21480874409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 516096, while the sum is 47.

The spelling of 21480874409 in words is "twenty-one billion, four hundred eighty million, eight hundred seventy-four thousand, four hundred nine".