102112021 has 6 divisors (see below), whose sum is σ = 112238966. Its totient is φ = 92829000.

The previous prime is 102112009. The next prime is 102112063. The reversal of 102112021 is 120211201.

It can be written as a sum of positive squares in only one way, i.e., 71740900 + 30371121 = 8470^2 + 5511^2 .

It is not a de Polignac number, because 102112021 - 2⁹ = 102111509 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 102111989 and 102112007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102112121) 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, 421830 + ... + 422071.

Almost surely, 2^102112021 is an apocalyptic number.

102112021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

102112021 is a deficient number, since it is larger than the sum of its proper divisors (10126945).

102112021 is an equidigital number, since it uses as much as digits as its factorization.

102112021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 843923 (or 843912 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 10.

The square root of 102112021 is about 10105.0492824132. The cubic root of 102112021 is about 467.4038556612.

Adding to 102112021 its reverse (120211201), we get a palindrome (222323222).

The spelling of 102112021 in words is "one hundred two million, one hundred twelve thousand, twenty-one".