2121943 has 2 divisors, whose sum is σ = 2121944. Its totient is φ = 2121942.

The previous prime is 2121941. The next prime is 2121967. The reversal of 2121943 is 3491212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2121943 - 2¹ = 2121941 is a prime.

Together with 2121941, it forms a pair of twin primes.

It is an Ulam number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2121941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1060971 + 1060972.

It is an arithmetic number, because the mean of its divisors is an integer number (1060972).

2^2121943 is an apocalyptic number.

2121943 is a deficient number, since it is larger than the sum of its proper divisors (1).

2121943 is an equidigital number, since it uses as much as digits as its factorization.

2121943 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 432, while the sum is 22.

The square root of 2121943 is about 1456.6890539851. The cubic root of 2121943 is about 128.5023996887.

The spelling of 2121943 in words is "two million, one hundred twenty-one thousand, nine hundred forty-three".