102120010001221 has 2 divisors, whose sum is σ = 102120010001222. Its totient is φ = 102120010001220.

The previous prime is 102120010001179. The next prime is 102120010001239. The reversal of 102120010001221 is 122100010021201.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 76111142188900 + 26008867812321 = 8724170^2 + 5099889^2 .

It is a cyclic number.

It is not a de Polignac number, because 102120010001221 - 2³⁵ = 102085650262853 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (102120010001281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51060005000610 + 51060005000611.

It is an arithmetic number, because the mean of its divisors is an integer number (51060005000611).

Almost surely, 2^{102120010001221} is an apocalyptic number.

It is an amenable number.

102120010001221 is a deficient number, since it is larger than the sum of its proper divisors (1).

102120010001221 is an equidigital number, since it uses as much as digits as its factorization.

102120010001221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 102120010001221 its reverse (122100010021201), we get a palindrome (224220020022422).

The spelling of 102120010001221 in words is "one hundred two trillion, one hundred twenty billion, ten million, one thousand, two hundred twenty-one".