21020002210001 has 2 divisors, whose sum is σ = 21020002210002. Its totient is φ = 21020002210000.

The previous prime is 21020002209959. The next prime is 21020002210007. The reversal of 21020002210001 is 10001220002012.

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., 17460497387776 + 3559504822225 = 4178576^2 + 1886665^2 .

It is a cyclic number.

It is not a de Polignac number, because 21020002210001 - 2⁶ = 21020002209937 is a prime.

It is not a weakly prime, because it can be changed into another prime (21020002210007) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10510001105000 + 10510001105001.

It is an arithmetic number, because the mean of its divisors is an integer number (10510001105001).

Almost surely, 2^{21020002210001} is an apocalyptic number.

It is an amenable number.

21020002210001 is a deficient number, since it is larger than the sum of its proper divisors (1).

21020002210001 is an equidigital number, since it uses as much as digits as its factorization.

21020002210001 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 21020002210001 its reverse (10001220002012), we get a palindrome (31021222212013).

The spelling of 21020002210001 in words is "twenty-one trillion, twenty billion, two million, two hundred ten thousand, one".