102020020010221 has 6 divisors (see below), whose sum is σ = 104569003260266. Its totient is φ = 99531726837600.

The previous prime is 102020020010213. The next prime is 102020020010261. The reversal of 102020020010221 is 122010020020201.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 26201396812900 + 75818623197321 = 5118730^2 + 8707389^2 .

It is not a de Polignac number, because 102020020010221 - 2³ = 102020020010213 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102020020010261) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 30345036990 + ... + 30345040351.

Almost surely, 2^{102020020010221} is an apocalyptic number.

It is an amenable number.

102020020010221 is a deficient number, since it is larger than the sum of its proper divisors (2548983250045).

102020020010221 is an frugal number, since it uses more digits than its factorization.

102020020010221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60690077423 (or 60690077382 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 102020020010221 its reverse (122010020020201), we get a palindrome (224030040030422).

The spelling of 102020020010221 in words is "one hundred two trillion, twenty billion, twenty million, ten thousand, two hundred twenty-one".