112216021 has 2 divisors, whose sum is σ = 112216022. Its totient is φ = 112216020.

The previous prime is 112216019. The next prime is 112216037. The reversal of 112216021 is 120612211.

It is an a-pointer prime, because the next prime (112216037) can be obtained adding 112216021 to its sum of digits (16).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 56415121 + 55800900 = 7511^2 + 7470^2 .

It is a cyclic number.

It is not a de Polignac number, because 112216021 - 2¹ = 112216019 is a prime.

Together with 112216019, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 112215986 and 112216004.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (112216081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 56108010 + 56108011.

It is an arithmetic number, because the mean of its divisors is an integer number (56108011).

Almost surely, 2^112216021 is an apocalyptic number.

It is an amenable number.

112216021 is a deficient number, since it is larger than the sum of its proper divisors (1).

112216021 is an equidigital number, since it uses as much as digits as its factorization.

112216021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48, while the sum is 16.

The square root of 112216021 is about 10593.2063606823. The cubic root of 112216021 is about 482.3381593646.

Adding to 112216021 its reverse (120612211), we get a palindrome (232828232).

The spelling of 112216021 in words is "one hundred twelve million, two hundred sixteen thousand, twenty-one".