21152010115417 has 2 divisors, whose sum is σ = 21152010115418. Its totient is φ = 21152010115416.

The previous prime is 21152010115351. The next prime is 21152010115451. The reversal of 21152010115417 is 71451101025112.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19222866903321 + 1929143212096 = 4384389^2 + 1388936^2 .

It is a cyclic number.

It is not a de Polignac number, because 21152010115417 - 2¹¹ = 21152010113369 is a prime.

It is a super-2 number, since 2×21152010115417² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21152010155417) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10576005057708 + 10576005057709.

It is an arithmetic number, because the mean of its divisors is an integer number (10576005057709).

Almost surely, 2^{21152010115417} is an apocalyptic number.

It is an amenable number.

21152010115417 is a deficient number, since it is larger than the sum of its proper divisors (1).

21152010115417 is an equidigital number, since it uses as much as digits as its factorization.

21152010115417 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2800, while the sum is 31.

The spelling of 21152010115417 in words is "twenty-one trillion, one hundred fifty-two billion, ten million, one hundred fifteen thousand, four hundred seventeen".