7112219921 has 2 divisors, whose sum is σ = 7112219922. Its totient is φ = 7112219920.

The previous prime is 7112219899. The next prime is 7112219923. The reversal of 7112219921 is 1299122117.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4219931521 + 2892288400 = 64961^2 + 53780^2 .

It is an emirp because it is prime and its reverse (1299122117) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 7112219921 - 2¹⁸ = 7111957777 is a prime.

Together with 7112219923, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (7112219923) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3556109960 + 3556109961.

It is an arithmetic number, because the mean of its divisors is an integer number (3556109961).

Almost surely, 2^7112219921 is an apocalyptic number.

It is an amenable number.

7112219921 is a deficient number, since it is larger than the sum of its proper divisors (1).

7112219921 is an equidigital number, since it uses as much as digits as its factorization.

7112219921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4536, while the sum is 35.

The square root of 7112219921 is about 84333.9784487842. The cubic root of 7112219921 is about 1923.0993706687.

The spelling of 7112219921 in words is "seven billion, one hundred twelve million, two hundred nineteen thousand, nine hundred twenty-one".