21000002222201 has 2 divisors, whose sum is σ = 21000002222202. Its totient is φ = 21000002222200.

The previous prime is 21000002222197. The next prime is 21000002222231. The reversal of 21000002222201 is 10222220000012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16224461761600 + 4775540460601 = 4027960^2 + 2185301^2 .

It is a cyclic number.

It is not a de Polignac number, because 21000002222201 - 2² = 21000002222197 is a prime.

It is not a weakly prime, because it can be changed into another prime (21000002222231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10500001111100 + 10500001111101.

It is an arithmetic number, because the mean of its divisors is an integer number (10500001111101).

Almost surely, 2^{21000002222201} is an apocalyptic number.

It is an amenable number.

21000002222201 is a deficient number, since it is larger than the sum of its proper divisors (1).

21000002222201 is an equidigital number, since it uses as much as digits as its factorization.

21000002222201 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64, while the sum is 14.

Adding to 21000002222201 its reverse (10222220000012), we get a palindrome (31222222222213).

The spelling of 21000002222201 in words is "twenty-one trillion, two million, two hundred twenty-two thousand, two hundred one".