21221202100201 has 2 divisors, whose sum is σ = 21221202100202. Its totient is φ = 21221202100200.

The previous prime is 21221202100199. The next prime is 21221202100223. The reversal of 21221202100201 is 10200120212212.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17364597397225 + 3856604702976 = 4167085^2 + 1963824^2 .

It is a cyclic number.

It is not a de Polignac number, because 21221202100201 - 2¹ = 21221202100199 is a prime.

Together with 21221202100199, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (21221202110201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10610601050100 + 10610601050101.

It is an arithmetic number, because the mean of its divisors is an integer number (10610601050101).

Almost surely, 2^{21221202100201} is an apocalyptic number.

It is an amenable number.

21221202100201 is a deficient number, since it is larger than the sum of its proper divisors (1).

21221202100201 is an equidigital number, since it uses as much as digits as its factorization.

21221202100201 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21221202100201 its reverse (10200120212212), we get a palindrome (31421322312413).

The spelling of 21221202100201 in words is "twenty-one trillion, two hundred twenty-one billion, two hundred two million, one hundred thousand, two hundred one".