10021020212221 has 2 divisors, whose sum is σ = 10021020212222. Its totient is φ = 10021020212220.

The previous prime is 10021020212201. The next prime is 10021020212293. The reversal of 10021020212221 is 12221202012001.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7776234188100 + 2244786024121 = 2788590^2 + 1498261^2 .

It is an emirp because it is prime and its reverse (12221202012001) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-10021020212221 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 10021020212195 and 10021020212204.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (10021020212201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5010510106110 + 5010510106111.

It is an arithmetic number, because the mean of its divisors is an integer number (5010510106111).

Almost surely, 2^{10021020212221} is an apocalyptic number.

It is an amenable number.

10021020212221 is a deficient number, since it is larger than the sum of its proper divisors (1).

10021020212221 is an equidigital number, since it uses as much as digits as its factorization.

10021020212221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 10021020212221 its reverse (12221202012001), we get a palindrome (22242222224222).

The spelling of 10021020212221 in words is "ten trillion, twenty-one billion, twenty million, two hundred twelve thousand, two hundred twenty-one".