2112021421 has 2 divisors, whose sum is σ = 2112021422. Its totient is φ = 2112021420.

The previous prime is 2112021409. The next prime is 2112021521. The reversal of 2112021421 is 1241202112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1280852521 + 831168900 = 35789^2 + 28830^2 .

It is a cyclic number.

It is not a de Polignac number, because 2112021421 - 2⁵ = 2112021389 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2112021395 and 2112021404.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2112021521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1056010710 + 1056010711.

It is an arithmetic number, because the mean of its divisors is an integer number (1056010711).

Almost surely, 2^2112021421 is an apocalyptic number.

It is an amenable number.

2112021421 is a deficient number, since it is larger than the sum of its proper divisors (1).

2112021421 is an equidigital number, since it uses as much as digits as its factorization.

2112021421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64, while the sum is 16.

The square root of 2112021421 is about 45956.7342290550. The cubic root of 2112021421 is about 1283.0180696474.

Adding to 2112021421 its reverse (1241202112), we get a palindrome (3353223533).

The spelling of 2112021421 in words is "two billion, one hundred twelve million, twenty-one thousand, four hundred twenty-one".