21121001359999 has 2 divisors, whose sum is σ = 21121001360000. Its totient is φ = 21121001359998.

The previous prime is 21121001359963. The next prime is 21121001360033. The reversal of 21121001359999 is 99995310012112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21121001359999 - 2¹⁷ = 21121001228927 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21121001359099) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10560500679999 + 10560500680000.

It is an arithmetic number, because the mean of its divisors is an integer number (10560500680000).

Almost surely, 2^{21121001359999} is an apocalyptic number.

21121001359999 is a deficient number, since it is larger than the sum of its proper divisors (1).

21121001359999 is an equidigital number, since it uses as much as digits as its factorization.

21121001359999 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 393660, while the sum is 52.

The spelling of 21121001359999 in words is "twenty-one trillion, one hundred twenty-one billion, one million, three hundred fifty-nine thousand, nine hundred ninety-nine".