21715510252619 has 2 divisors, whose sum is σ = 21715510252620. Its totient is φ = 21715510252618.

The previous prime is 21715510252559. The next prime is 21715510252621. The reversal of 21715510252619 is 91625201551712.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21715510252619 is a prime.

It is a super-2 number, since 2×21715510252619² (a number of 27 digits) contains 22 as substring.

Together with 21715510252621, 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 (21715510252519) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10857755126309 + 10857755126310.

It is an arithmetic number, because the mean of its divisors is an integer number (10857755126310).

Almost surely, 2^{21715510252619} is an apocalyptic number.

21715510252619 is a deficient number, since it is larger than the sum of its proper divisors (1).

21715510252619 is an equidigital number, since it uses as much as digits as its factorization.

21715510252619 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 378000, while the sum is 47.

The spelling of 21715510252619 in words is "twenty-one trillion, seven hundred fifteen billion, five hundred ten million, two hundred fifty-two thousand, six hundred nineteen".