21202009999993 has 2 divisors, whose sum is σ = 21202009999994. Its totient is φ = 21202009999992.

The previous prime is 21202009999967. The next prime is 21202010000027. The reversal of 21202009999993 is 39999990020212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20137404950784 + 1064605049209 = 4487472^2 + 1031797^2 .

It is a cyclic number.

It is not a de Polignac number, because 21202009999993 - 2²¹ = 21202007902841 is a prime.

It is not a weakly prime, because it can be changed into another prime (21202001999993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10601004999996 + 10601004999997.

It is an arithmetic number, because the mean of its divisors is an integer number (10601004999997).

Almost surely, 2^{21202009999993} is an apocalyptic number.

It is an amenable number.

21202009999993 is a deficient number, since it is larger than the sum of its proper divisors (1).

21202009999993 is an equidigital number, since it uses as much as digits as its factorization.

21202009999993 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12754584, while the sum is 64.

The spelling of 21202009999993 in words is "twenty-one trillion, two hundred two billion, nine million, nine hundred ninety-nine thousand, nine hundred ninety-three".