21152515317319 has 2 divisors, whose sum is σ = 21152515317320. Its totient is φ = 21152515317318.

The previous prime is 21152515317293. The next prime is 21152515317337. The reversal of 21152515317319 is 91371351525112.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21152515317319 - 2¹⁹ = 21152514793031 is a prime.

It is a super-2 number, since 2×21152515317319² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21152515317389) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10576257658659 + 10576257658660.

It is an arithmetic number, because the mean of its divisors is an integer number (10576257658660).

Almost surely, 2^{21152515317319} is an apocalyptic number.

21152515317319 is a deficient number, since it is larger than the sum of its proper divisors (1).

21152515317319 is an equidigital number, since it uses as much as digits as its factorization.

21152515317319 is an evil number, because the sum of its binary digits is even.

The product of its digits is 283500, while the sum is 46.

The spelling of 21152515317319 in words is "twenty-one trillion, one hundred fifty-two billion, five hundred fifteen million, three hundred seventeen thousand, three hundred nineteen".