2129401 has 2 divisors, whose sum is σ = 2129402. Its totient is φ = 2129400.

The previous prime is 2129399. The next prime is 2129419. The reversal of 2129401 is 1049212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1207801 + 921600 = 1099^2 + 960^2 .

It is a cyclic number.

It is not a de Polignac number, because 2129401 - 2¹ = 2129399 is a prime.

Together with 2129399, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (2129431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1064700 + 1064701.

It is an arithmetic number, because the mean of its divisors is an integer number (1064701).

2^2129401 is an apocalyptic number.

It is an amenable number.

2129401 is a deficient number, since it is larger than the sum of its proper divisors (1).

2129401 is an equidigital number, since it uses as much as digits as its factorization.

2129401 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 19.

The square root of 2129401 is about 1459.2467234844. The cubic root of 2129401 is about 128.6527729218.

The spelling of 2129401 in words is "two million, one hundred twenty-nine thousand, four hundred one".