3996141221 has 4 divisors (see below), whose sum is σ = 3997711500. Its totient is φ = 3994570944.

The previous prime is 3996141203. The next prime is 3996141239. The reversal of 3996141221 is 1221416993.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1221416993 = 7937 ⋅153889.

It is an interprime number because it is at equal distance from previous prime (3996141203) and next prime (3996141239).

It can be written as a sum of positive squares in 2 ways, for example, as 3905625025 + 90516196 = 62495^2 + 9514^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3996141221 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3996141241) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 781316 + ... + 786413.

It is an arithmetic number, because the mean of its divisors is an integer number (999427875).

Almost surely, 2^3996141221 is an apocalyptic number.

It is an amenable number.

3996141221 is a deficient number, since it is larger than the sum of its proper divisors (1570279).

3996141221 is a wasteful number, since it uses less digits than its factorization.

3996141221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1570278.

The product of its digits is 23328, while the sum is 38.

The square root of 3996141221 is about 63215.0395159253. The cubic root of 3996141221 is about 1586.8904352496.

The spelling of 3996141221 in words is "three billion, nine hundred ninety-six million, one hundred forty-one thousand, two hundred twenty-one".