102221110021 has 4 divisors (see below), whose sum is σ = 102229211692. Its totient is φ = 102213008352.

The previous prime is 102221109959. The next prime is 102221110049. The reversal of 102221110021 is 120011122201.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 120011122201 = 211 ⋅568773091.

It can be written as a sum of positive squares in 2 ways, for example, as 31502345121 + 70718764900 = 177489^2 + 265930^2 .

It is a cyclic number.

It is not a de Polignac number, because 102221110021 - 2²⁹ = 101684239109 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 102221109983 and 102221110010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102221110081) 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, 4031880 + ... + 4057153.

It is an arithmetic number, because the mean of its divisors is an integer number (25557302923).

Almost surely, 2^102221110021 is an apocalyptic number.

It is an amenable number.

102221110021 is a deficient number, since it is larger than the sum of its proper divisors (8101671).

102221110021 is an equidigital number, since it uses as much as digits as its factorization.

102221110021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8101670.

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

Adding to 102221110021 its reverse (120011122201), we get a palindrome (222232232222).

The spelling of 102221110021 in words is "one hundred two billion, two hundred twenty-one million, one hundred ten thousand, twenty-one".