3920722121 has 8 divisors (see below), whose sum is σ = 4151899944. Its totient is φ = 3689605120.

The previous prime is 3920722111. The next prime is 3920722123. The reversal of 3920722121 is 1212270293.

3920722121 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 231374521 + 3689347600 = 15211^2 + 60740^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3920722121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3920722123) 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, 240881 + ... + 256641.

It is an arithmetic number, because the mean of its divisors is an integer number (518987493).

Almost surely, 2^3920722121 is an apocalyptic number.

It is an amenable number.

3920722121 is a deficient number, since it is larger than the sum of its proper divisors (231177823).

3920722121 is a wasteful number, since it uses less digits than its factorization.

3920722121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30411.

The product of its (nonzero) digits is 3024, while the sum is 29.

The square root of 3920722121 is about 62615.6699317351. The cubic root of 3920722121 is about 1576.8438465866.

The spelling of 3920722121 in words is "three billion, nine hundred twenty million, seven hundred twenty-two thousand, one hundred twenty-one".