4036191921 has 12 divisors (see below), whose sum is σ = 5830652100. Its totient is φ = 2690519040.

The previous prime is 4036191911. The next prime is 4036191967. The reversal of 4036191921 is 1291916304.

It is a happy number.

4036191921 is a `hidden beast` number, since 4 + 0 + 3 + 619 + 19 + 21 = 666.

4036191921 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 2737382400 + 1298809521 = 52320^2 + 36039^2 .

It is not a de Polignac number, because 4036191921 - 2⁵ = 4036191889 is a prime.

It is not an unprimeable number, because it can be changed into a prime (4036191911) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 110805 + ... + 142653.

It is an arithmetic number, because the mean of its divisors is an integer number (485887675).

Almost surely, 2^4036191921 is an apocalyptic number.

It is an amenable number.

4036191921 is a deficient number, since it is larger than the sum of its proper divisors (1794460179).

4036191921 is a wasteful number, since it uses less digits than its factorization.

4036191921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45936 (or 45933 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 36.

The square root of 4036191921 is about 63531.0311658799. The cubic root of 4036191921 is about 1592.1742758939.

The spelling of 4036191921 in words is "four billion, thirty-six million, one hundred ninety-one thousand, nine hundred twenty-one".