102021200001221 has 2 divisors, whose sum is σ = 102021200001222. Its totient is φ = 102021200001220.

The previous prime is 102021200001187. The next prime is 102021200001271. The reversal of 102021200001221 is 122100002120201.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 92035031193121 + 9986168808100 = 9593489^2 + 3160090^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-102021200001221 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 102021200001196 and 102021200001205.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (102021200001271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51010600000610 + 51010600000611.

It is an arithmetic number, because the mean of its divisors is an integer number (51010600000611).

Almost surely, 2^{102021200001221} is an apocalyptic number.

It is an amenable number.

102021200001221 is a deficient number, since it is larger than the sum of its proper divisors (1).

102021200001221 is an equidigital number, since it uses as much as digits as its factorization.

102021200001221 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 102021200001221 its reverse (122100002120201), we get a palindrome (224121202121422).

The spelling of 102021200001221 in words is "one hundred two trillion, twenty-one billion, two hundred million, one thousand, two hundred twenty-one".