10206243215221 has 2 divisors, whose sum is σ = 10206243215222. Its totient is φ = 10206243215220.

The previous prime is 10206243215219. The next prime is 10206243215411. The reversal of 10206243215221 is 12251234260201.

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., 9874432654321 + 331810560900 = 3142361^2 + 576030^2 .

It is a cyclic number.

It is not a de Polignac number, because 10206243215221 - 2¹ = 10206243215219 is a prime.

Together with 10206243215219, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (10206243215521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5103121607610 + 5103121607611.

It is an arithmetic number, because the mean of its divisors is an integer number (5103121607611).

Almost surely, 2^{10206243215221} is an apocalyptic number.

It is an amenable number.

10206243215221 is a deficient number, since it is larger than the sum of its proper divisors (1).

10206243215221 is an equidigital number, since it uses as much as digits as its factorization.

10206243215221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11520, while the sum is 31.

Adding to 10206243215221 its reverse (12251234260201), we get a palindrome (22457477475422).

The spelling of 10206243215221 in words is "ten trillion, two hundred six billion, two hundred forty-three million, two hundred fifteen thousand, two hundred twenty-one".