21753024409 has 2 divisors, whose sum is σ = 21753024410. Its totient is φ = 21753024408.

The previous prime is 21753024367. The next prime is 21753024413. The reversal of 21753024409 is 90442035712.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21503289600 + 249734809 = 146640^2 + 15803^2 .

It is a cyclic number.

It is not a de Polignac number, because 21753024409 - 2¹³ = 21753016217 is a prime.

It is not a weakly prime, because it can be changed into another prime (21753025409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10876512204 + 10876512205.

It is an arithmetic number, because the mean of its divisors is an integer number (10876512205).

Almost surely, 2^21753024409 is an apocalyptic number.

It is an amenable number.

21753024409 is a deficient number, since it is larger than the sum of its proper divisors (1).

21753024409 is an equidigital number, since it uses as much as digits as its factorization.

21753024409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 60480, while the sum is 37.

The spelling of 21753024409 in words is "twenty-one billion, seven hundred fifty-three million, twenty-four thousand, four hundred nine".