102021021212221 has 2 divisors, whose sum is σ = 102021021212222. Its totient is φ = 102021021212220.

The previous prime is 102021021212171. The next prime is 102021021212233. The reversal of 102021021212221 is 122212120120201.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 101581201562500 + 439819649721 = 10078750^2 + 663189^2 .

It is a cyclic number.

It is not a de Polignac number, because 102021021212221 - 2³⁹ = 101471265398333 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (102021021212291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51010510606110 + 51010510606111.

It is an arithmetic number, because the mean of its divisors is an integer number (51010510606111).

Almost surely, 2^{102021021212221} is an apocalyptic number.

It is an amenable number.

102021021212221 is a deficient number, since it is larger than the sum of its proper divisors (1).

102021021212221 is an equidigital number, since it uses as much as digits as its factorization.

102021021212221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 102021021212221 its reverse (122212120120201), we get a palindrome (224233141332422).

The spelling of 102021021212221 in words is "one hundred two trillion, twenty-one billion, twenty-one million, two hundred twelve thousand, two hundred twenty-one".