102020110010221 has 4 divisors (see below), whose sum is σ = 109867810780252. Its totient is φ = 94172409240192.

The previous prime is 102020110010207. The next prime is 102020110010233. The reversal of 102020110010221 is 122010011020201.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 9850778574025 + 92169331436196 = 3138595^2 + 9600486^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-102020110010221 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13), and also a Moran number because the ratio is a prime number: 7847700770017 = 102020110010221 / (1 + 0 + 2 + 0 + 2 + 0 + 1 + 1 + 0 + 0 + 1 + 0 + 2 + 2 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102020110010251) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3923850384996 + ... + 3923850385021.

It is an arithmetic number, because the mean of its divisors is an integer number (27466952695063).

Almost surely, 2^{102020110010221} is an apocalyptic number.

It is an amenable number.

102020110010221 is a deficient number, since it is larger than the sum of its proper divisors (7847700770031).

102020110010221 is an equidigital number, since it uses as much as digits as its factorization.

102020110010221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7847700770030.

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

Adding to 102020110010221 its reverse (122010011020201), we get a palindrome (224030121030422).

The spelling of 102020110010221 in words is "one hundred two trillion, twenty billion, one hundred ten million, ten thousand, two hundred twenty-one".