210011212010021 has 2 divisors, whose sum is σ = 210011212010022. Its totient is φ = 210011212010020.

The previous prime is 210011212010009. The next prime is 210011212010063. The reversal of 210011212010021 is 120010212110012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 197433017779396 + 12578194230625 = 14051086^2 + 3546575^2 .

It is a cyclic number.

It is not a de Polignac number, because 210011212010021 - 2²⁶ = 210011144901157 is a prime.

It is a super-2 number, since 2×210011212010021² (a number of 29 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 210011212009978 and 210011212010005.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (210011212010221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105005606005010 + 105005606005011.

It is an arithmetic number, because the mean of its divisors is an integer number (105005606005011).

Almost surely, 2^{210011212010021} is an apocalyptic number.

It is an amenable number.

210011212010021 is a deficient number, since it is larger than the sum of its proper divisors (1).

210011212010021 is an equidigital number, since it uses as much as digits as its factorization.

210011212010021 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 14.

Adding to 210011212010021 its reverse (120010212110012), we get a palindrome (330021424120033).

Subtracting from 210011212010021 its reverse (120010212110012), we obtain a palindrome (90000999900009).

The spelling of 210011212010021 in words is "two hundred ten trillion, eleven billion, two hundred twelve million, ten thousand, twenty-one".