10021020012221 has 2 divisors, whose sum is σ = 10021020012222. Its totient is φ = 10021020012220.

The previous prime is 10021020012217. The next prime is 10021020012257. The reversal of 10021020012221 is 12221002012001.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6623674322500 + 3397345689721 = 2573650^2 + 1843189^2 .

It is a cyclic number.

It is not a de Polignac number, because 10021020012221 - 2² = 10021020012217 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 10021020012196 and 10021020012205.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (10021020012121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5010510006110 + 5010510006111.

It is an arithmetic number, because the mean of its divisors is an integer number (5010510006111).

Almost surely, 2^{10021020012221} is an apocalyptic number.

It is an amenable number.

10021020012221 is a deficient number, since it is larger than the sum of its proper divisors (1).

10021020012221 is an equidigital number, since it uses as much as digits as its factorization.

10021020012221 is an evil number, because the sum of its binary digits is even.

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

Adding to 10021020012221 its reverse (12221002012001), we get a palindrome (22242022024222).

The spelling of 10021020012221 in words is "ten trillion, twenty-one billion, twenty million, twelve thousand, two hundred twenty-one".