2102012010221 has 2 divisors, whose sum is σ = 2102012010222. Its totient is φ = 2102012010220.

The previous prime is 2102012010211. The next prime is 2102012010233. The reversal of 2102012010221 is 1220102102012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1720163402500 + 381848607721 = 1311550^2 + 617939^2 .

It is a cyclic number.

It is not a de Polignac number, because 2102012010221 - 2¹⁰ = 2102012009197 is a prime.

It is a super-2 number, since 2×2102012010221² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 2102012010196 and 2102012010205.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2102012010211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1051006005110 + 1051006005111.

It is an arithmetic number, because the mean of its divisors is an integer number (1051006005111).

Almost surely, 2^{2102012010221} is an apocalyptic number.

It is an amenable number.

2102012010221 is a deficient number, since it is larger than the sum of its proper divisors (1).

2102012010221 is an equidigital number, since it uses as much as digits as its factorization.

2102012010221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 2102012010221 its reverse (1220102102012), we get a palindrome (3322114112233).

The spelling of 2102012010221 in words is "two trillion, one hundred two billion, twelve million, ten thousand, two hundred twenty-one".