4064019921 has 24 divisors (see below), whose sum is σ = 6384419496. Its totient is φ = 2476166400.

The previous prime is 4064019919. The next prime is 4064019929. The reversal of 4064019921 is 1299104604.

It is a happy number.

4064019921 is a `hidden beast` number, since 4 + 0 + 640 + 1 + 9 + 9 + 2 + 1 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 504227025 + 3559792896 = 22455^2 + 59664^2 .

It is not a de Polignac number, because 4064019921 - 2¹ = 4064019919 is a prime.

It is not an unprimeable number, because it can be changed into a prime (4064019929) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 160140 + ... + 183773.

It is an arithmetic number, because the mean of its divisors is an integer number (266017479).

Almost surely, 2^4064019921 is an apocalyptic number.

It is an amenable number.

4064019921 is a deficient number, since it is larger than the sum of its proper divisors (2320399575).

4064019921 is a wasteful number, since it uses less digits than its factorization.

4064019921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 344033 (or 344030 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 36.

The square root of 4064019921 is about 63749.6660461841. Note that the first 3 decimals coincide. The cubic root of 4064019921 is about 1595.8250427715.

The spelling of 4064019921 in words is "four billion, sixty-four million, nineteen thousand, nine hundred twenty-one".