102220112021 has 4 divisors (see below), whose sum is σ = 105744943500. Its totient is φ = 98695280544.

The previous prime is 102220112009. The next prime is 102220112041. The reversal of 102220112021 is 120211022201.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 120211022201 = 21961 ⋅5473841.

It can be written as a sum of positive squares in 2 ways, for example, as 67657212100 + 34562899921 = 260110^2 + 185911^2 .

It is a de Polignac number, because none of the positive numbers 2^k-102220112021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 102220111987 and 102220112005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102220112041) 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, 1762415696 + ... + 1762415753.

It is an arithmetic number, because the mean of its divisors is an integer number (26436235875).

Almost surely, 2^102220112021 is an apocalyptic number.

It is an amenable number.

102220112021 is a deficient number, since it is larger than the sum of its proper divisors (3524831479).

102220112021 is an equidigital number, since it uses as much as digits as its factorization.

102220112021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3524831478.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 102220112021 its reverse (120211022201), we get a palindrome (222431134222).

It can be divided in two parts, 1022201 and 12021, that multiplied together give a palindrome (12287878221).

The spelling of 102220112021 in words is "one hundred two billion, two hundred twenty million, one hundred twelve thousand, twenty-one".