2212123421 has 2 divisors, whose sum is σ = 2212123422. Its totient is φ = 2212123420.

The previous prime is 2212123373. The next prime is 2212123439. The reversal of 2212123421 is 1243212122.

2212123421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1279492900 + 932630521 = 35770^2 + 30539^2 .

It is a cyclic number.

It is not a de Polignac number, because 2212123421 - 2¹⁸ = 2211861277 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2212123393 and 2212123402.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2212123021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1106061710 + 1106061711.

It is an arithmetic number, because the mean of its divisors is an integer number (1106061711).

Almost surely, 2^2212123421 is an apocalyptic number.

It is an amenable number.

2212123421 is a deficient number, since it is larger than the sum of its proper divisors (1).

2212123421 is an equidigital number, since it uses as much as digits as its factorization.

2212123421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 384, while the sum is 20.

The square root of 2212123421 is about 47033.2161456135. The cubic root of 2212123421 is about 1302.9761048442.

Adding to 2212123421 its reverse (1243212122), we get a palindrome (3455335543).

The spelling of 2212123421 in words is "two billion, two hundred twelve million, one hundred twenty-three thousand, four hundred twenty-one".