21202122200981 has 2 divisors, whose sum is σ = 21202122200982. Its totient is φ = 21202122200980.

The previous prime is 21202122200969. The next prime is 21202122201041. The reversal of 21202122200981 is 18900222120212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20854146089956 + 347976111025 = 4566634^2 + 589895^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21202122200981 is a prime.

It is a super-2 number, since 2×21202122200981² (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 (21202122202981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10601061100490 + 10601061100491.

It is an arithmetic number, because the mean of its divisors is an integer number (10601061100491).

Almost surely, 2^{21202122200981} is an apocalyptic number.

It is an amenable number.

21202122200981 is a deficient number, since it is larger than the sum of its proper divisors (1).

21202122200981 is an equidigital number, since it uses as much as digits as its factorization.

21202122200981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4608, while the sum is 32.

The spelling of 21202122200981 in words is "twenty-one trillion, two hundred two billion, one hundred twenty-two million, two hundred thousand, nine hundred eighty-one".