21001210202201 has 2 divisors, whose sum is σ = 21001210202202. Its totient is φ = 21001210202200.

The previous prime is 21001210202183. The next prime is 21001210202213. The reversal of 21001210202201 is 10220201210012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20611554600025 + 389655602176 = 4539995^2 + 624224^2 .

It is a cyclic number.

It is not a de Polignac number, because 21001210202201 - 2¹⁰ = 21001210201177 is a prime.

It is not a weakly prime, because it can be changed into another prime (21001210208201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10500605101100 + 10500605101101.

It is an arithmetic number, because the mean of its divisors is an integer number (10500605101101).

Almost surely, 2^{21001210202201} is an apocalyptic number.

It is an amenable number.

21001210202201 is a deficient number, since it is larger than the sum of its proper divisors (1).

21001210202201 is an equidigital number, since it uses as much as digits as its factorization.

21001210202201 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21001210202201 its reverse (10220201210012), we get a palindrome (31221411412213).

The spelling of 21001210202201 in words is "twenty-one trillion, one billion, two hundred ten million, two hundred two thousand, two hundred one".