21210021002101 has 2 divisors, whose sum is σ = 21210021002102. Its totient is φ = 21210021002100.

The previous prime is 21210021002057. The next prime is 21210021002171. The reversal of 21210021002101 is 10120012001212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11802151801476 + 9407869200625 = 3435426^2 + 3067225^2 .

It is a cyclic number.

It is not a de Polignac number, because 21210021002101 - 2⁷ = 21210021001973 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21210021002171) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10605010501050 + 10605010501051.

It is an arithmetic number, because the mean of its divisors is an integer number (10605010501051).

Almost surely, 2^{21210021002101} is an apocalyptic number.

It is an amenable number.

21210021002101 is a deficient number, since it is larger than the sum of its proper divisors (1).

21210021002101 is an equidigital number, since it uses as much as digits as its factorization.

21210021002101 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 13.

Adding to 21210021002101 its reverse (10120012001212), we get a palindrome (31330033003313).

The spelling of 21210021002101 in words is "twenty-one trillion, two hundred ten billion, twenty-one million, two thousand, one hundred one".