2134404721 has 4 divisors (see below), whose sum is σ = 2135314944. Its totient is φ = 2133494500.

The previous prime is 2134404707. The next prime is 2134404731. The reversal of 2134404721 is 1274044312.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2134404721 - 2⁷ = 2134404593 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2134404721.

It is not an unprimeable number, because it can be changed into a prime (2134404731) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 451585 + ... + 456286.

It is an arithmetic number, because the mean of its divisors is an integer number (533828736).

Almost surely, 2^2134404721 is an apocalyptic number.

It is an amenable number.

2134404721 is a deficient number, since it is larger than the sum of its proper divisors (910223).

2134404721 is an equidigital number, since it uses as much as digits as its factorization.

2134404721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 910222.

The product of its (nonzero) digits is 5376, while the sum is 28.

The square root of 2134404721 is about 46199.6181910630. The cubic root of 2134404721 is about 1287.5346462038.

The spelling of 2134404721 in words is "two billion, one hundred thirty-four million, four hundred four thousand, seven hundred twenty-one".