4073821921 has 8 divisors (see below), whose sum is σ = 4391389800. Its totient is φ = 3756853632.

The previous prime is 4073821861. The next prime is 4073821931. The reversal of 4073821921 is 1291283704.

It can be written as a sum of positive squares in 4 ways, for example, as 52359696 + 4021462225 = 7236^2 + 63415^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 4073821921 - 2¹⁷ = 4073690849 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4073821931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 135730 + ... + 163003.

It is an arithmetic number, because the mean of its divisors is an integer number (548923725).

Almost surely, 2^4073821921 is an apocalyptic number.

It is an amenable number.

4073821921 is a deficient number, since it is larger than the sum of its proper divisors (317567879).

4073821921 is a wasteful number, since it uses less digits than its factorization.

4073821921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 299795.

The product of its (nonzero) digits is 24192, while the sum is 37.

The square root of 4073821921 is about 63826.4985801352. The cubic root of 4073821921 is about 1597.1070015496.

The spelling of 4073821921 in words is "four billion, seventy-three million, eight hundred twenty-one thousand, nine hundred twenty-one".