21617129363 has 2 divisors, whose sum is σ = 21617129364. Its totient is φ = 21617129362.

The previous prime is 21617129341. The next prime is 21617129389. The reversal of 21617129363 is 36392171612.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21617129363 - 2⁶ = 21617129299 is a prime.

It is a super-3 number, since 3×21617129363³ (a number of 32 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21617129363.

It is not a weakly prime, because it can be changed into another prime (21617129063) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10808564681 + 10808564682.

It is an arithmetic number, because the mean of its divisors is an integer number (10808564682).

Almost surely, 2^21617129363 is an apocalyptic number.

21617129363 is a deficient number, since it is larger than the sum of its proper divisors (1).

21617129363 is an equidigital number, since it uses as much as digits as its factorization.

21617129363 is an evil number, because the sum of its binary digits is even.

The product of its digits is 81648, while the sum is 41.

The spelling of 21617129363 in words is "twenty-one billion, six hundred seventeen million, one hundred twenty-nine thousand, three hundred sixty-three".