21130201222021 has 2 divisors, whose sum is σ = 21130201222022. Its totient is φ = 21130201222020.

The previous prime is 21130201222019. The next prime is 21130201222087. The reversal of 21130201222021 is 12022210203112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19203895950625 + 1926305271396 = 4382225^2 + 1387914^2 .

It is a cyclic number.

It is not a de Polignac number, because 21130201222021 - 2¹ = 21130201222019 is a prime.

Together with 21130201222019, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 21130201222021.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21130201222001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10565100611010 + 10565100611011.

It is an arithmetic number, because the mean of its divisors is an integer number (10565100611011).

Almost surely, 2^{21130201222021} is an apocalyptic number.

It is an amenable number.

21130201222021 is a deficient number, since it is larger than the sum of its proper divisors (1).

21130201222021 is an equidigital number, since it uses as much as digits as its factorization.

21130201222021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 192, while the sum is 19.

Adding to 21130201222021 its reverse (12022210203112), we get a palindrome (33152411425133).

The spelling of 21130201222021 in words is "twenty-one trillion, one hundred thirty billion, two hundred one million, two hundred twenty-two thousand, twenty-one".