2112123421 has 2 divisors, whose sum is σ = 2112123422. Its totient is φ = 2112123420.

The previous prime is 2112123379. The next prime is 2112123427. The reversal of 2112123421 is 1243212112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1943487225 + 168636196 = 44085^2 + 12986^2 .

It is a cyclic number.

It is not a de Polignac number, because 2112123421 - 2¹¹ = 2112121373 is a prime.

It is a super-2 number, since 2×2112123421² = 8922130691073486482, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2112123427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1056061710 + 1056061711.

It is an arithmetic number, because the mean of its divisors is an integer number (1056061711).

Almost surely, 2^2112123421 is an apocalyptic number.

It is an amenable number.

2112123421 is a deficient number, since it is larger than the sum of its proper divisors (1).

2112123421 is an equidigital number, since it uses as much as digits as its factorization.

2112123421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 192, while the sum is 19.

The square root of 2112123421 is about 45957.8439550856. The cubic root of 2112123421 is about 1283.0387237523.

Adding to 2112123421 its reverse (1243212112), we get a palindrome (3355335533).

The spelling of 2112123421 in words is "two billion, one hundred twelve million, one hundred twenty-three thousand, four hundred twenty-one".