3865443222221 has 32 divisors (see below), whose sum is σ = 4584266378496. Its totient is φ = 3190450752000.

The previous prime is 3865443222209. The next prime is 3865443222233. The reversal of 3865443222221 is 1222223445683.

It is an interprime number because it is at equal distance from previous prime (3865443222209) and next prime (3865443222233).

It is a de Polignac number, because none of the positive numbers 2^k-3865443222221 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3865443222281) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 25197611 + ... + 25350551.

It is an arithmetic number, because the mean of its divisors is an integer number (143258324328).

Almost surely, 2^{3865443222221} is an apocalyptic number.

It is an amenable number.

3865443222221 is a deficient number, since it is larger than the sum of its proper divisors (718823156275).

3865443222221 is a wasteful number, since it uses less digits than its factorization.

3865443222221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 154133.

The product of its digits is 1105920, while the sum is 44.

The spelling of 3865443222221 in words is "three trillion, eight hundred sixty-five billion, four hundred forty-three million, two hundred twenty-two thousand, two hundred twenty-one".