21210220002001 has 2 divisors, whose sum is σ = 21210220002002. Its totient is φ = 21210220002000.

The previous prime is 21210220001977. The next prime is 21210220002019. The reversal of 21210220002001 is 10020002201212.

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., 13711801673025 + 7498418328976 = 3702945^2 + 2738324^2 .

It is a cyclic number.

It is not a de Polignac number, because 21210220002001 - 2⁵ = 21210220001969 is a prime.

It is not a weakly prime, because it can be changed into another prime (21210220000001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10605110001000 + 10605110001001.

It is an arithmetic number, because the mean of its divisors is an integer number (10605110001001).

Almost surely, 2^{21210220002001} is an apocalyptic number.

It is an amenable number.

21210220002001 is a deficient number, since it is larger than the sum of its proper divisors (1).

21210220002001 is an equidigital number, since it uses as much as digits as its factorization.

21210220002001 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 21210220002001 its reverse (10020002201212), we get a palindrome (31230222203213).

The spelling of 21210220002001 in words is "twenty-one trillion, two hundred ten billion, two hundred twenty million, two thousand, one".