21223231020361 has 2 divisors, whose sum is σ = 21223231020362. Its totient is φ = 21223231020360.

The previous prime is 21223231020317. The next prime is 21223231020371. The reversal of 21223231020361 is 16302013232212.

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., 15323748677136 + 5899482343225 = 3914556^2 + 2428885^2 .

It is a cyclic number.

It is not a de Polignac number, because 21223231020361 - 2²⁵ = 21223197465929 is a prime.

It is a super-2 number, since 2×21223231020361² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21223231020311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10611615510180 + 10611615510181.

It is an arithmetic number, because the mean of its divisors is an integer number (10611615510181).

Almost surely, 2^{21223231020361} is an apocalyptic number.

It is an amenable number.

21223231020361 is a deficient number, since it is larger than the sum of its proper divisors (1).

21223231020361 is an equidigital number, since it uses as much as digits as its factorization.

21223231020361 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5184, while the sum is 28.

Adding to 21223231020361 its reverse (16302013232212), we get a palindrome (37525244252573).

The spelling of 21223231020361 in words is "twenty-one trillion, two hundred twenty-three billion, two hundred thirty-one million, twenty thousand, three hundred sixty-one".