3865261003221 has 16 divisors (see below), whose sum is σ = 5377816589184. Its totient is φ = 2464775632704.

The previous prime is 3865261003213. The next prime is 3865261003229. The reversal of 3865261003221 is 1223001625683.

It is a happy number.

3865261003221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (3865261003213) and next prime (3865261003229).

It is not a de Polignac number, because 3865261003221 - 2³ = 3865261003213 is a prime.

It is a super-2 number, since 2×3865261003221² (a number of 26 digits) contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 3865261003221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3865261003229) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6826255 + ... + 7370771.

It is an arithmetic number, because the mean of its divisors is an integer number (336113536824).

Almost surely, 2^{3865261003221} is an apocalyptic number.

It is an amenable number.

3865261003221 is a deficient number, since it is larger than the sum of its proper divisors (1512555585963).

3865261003221 is a wasteful number, since it uses less digits than its factorization.

3865261003221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 647420.

The product of its (nonzero) digits is 103680, while the sum is 39.

The spelling of 3865261003221 in words is "three trillion, eight hundred sixty-five billion, two hundred sixty-one million, three thousand, two hundred twenty-one".