102102101121221 has 2 divisors, whose sum is σ = 102102101121222. Its totient is φ = 102102101121220.

The previous prime is 102102101121133. The next prime is 102102101121247. The reversal of 102102101121221 is 122121101201201.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 63150597160225 + 38951503960996 = 7946735^2 + 6241114^2 .

It is a cyclic number.

It is not a de Polignac number, because 102102101121221 - 2²² = 102102096926917 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 102102101121221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (102102101121521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51051050560610 + 51051050560611.

It is an arithmetic number, because the mean of its divisors is an integer number (51051050560611).

Almost surely, 2^{102102101121221} is an apocalyptic number.

It is an amenable number.

102102101121221 is a deficient number, since it is larger than the sum of its proper divisors (1).

102102101121221 is an equidigital number, since it uses as much as digits as its factorization.

102102101121221 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 17.

Adding to 102102101121221 its reverse (122121101201201), we get a palindrome (224223202322422).

The spelling of 102102101121221 in words is "one hundred two trillion, one hundred two billion, one hundred one million, one hundred twenty-one thousand, two hundred twenty-one".