21753002639 has 2 divisors, whose sum is σ = 21753002640. Its totient is φ = 21753002638.

The previous prime is 21753002597. The next prime is 21753002641. The reversal of 21753002639 is 93620035712.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21753002639 is a prime.

Together with 21753002641, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21753002659) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10876501319 + 10876501320.

It is an arithmetic number, because the mean of its divisors is an integer number (10876501320).

Almost surely, 2^21753002639 is an apocalyptic number.

21753002639 is a deficient number, since it is larger than the sum of its proper divisors (1).

21753002639 is an equidigital number, since it uses as much as digits as its factorization.

21753002639 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 68040, while the sum is 38.

The spelling of 21753002639 in words is "twenty-one billion, seven hundred fifty-three million, two thousand, six hundred thirty-nine".