2121907 has 2 divisors, whose sum is σ = 2121908. Its totient is φ = 2121906.

The previous prime is 2121893. The next prime is 2121941. The reversal of 2121907 is 7091212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2121907 - 2¹⁹ = 1597619 is a prime.

It is not a weakly prime, because it can be changed into another prime (2121967) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1060953 + 1060954.

It is an arithmetic number, because the mean of its divisors is an integer number (1060954).

2^2121907 is an apocalyptic number.

2121907 is a deficient number, since it is larger than the sum of its proper divisors (1).

2121907 is an equidigital number, since it uses as much as digits as its factorization.

2121907 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 252, while the sum is 22.

The square root of 2121907 is about 1456.6766971432. The cubic root of 2121907 is about 128.5016729786.

The spelling of 2121907 in words is "two million, one hundred twenty-one thousand, nine hundred seven".