3865122421 has 4 divisors (see below), whose sum is σ = 3865256512. Its totient is φ = 3864988332.

The previous prime is 3865122403. The next prime is 3865122449. The reversal of 3865122421 is 1242215683.

3865122421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 3865122421 - 2¹¹ = 3865120373 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 (3865122721) 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, 4125 + ... + 88018.

It is an arithmetic number, because the mean of its divisors is an integer number (966314128).

Almost surely, 2^3865122421 is an apocalyptic number.

It is an amenable number.

3865122421 is a deficient number, since it is larger than the sum of its proper divisors (134091).

3865122421 is an equidigital number, since it uses as much as digits as its factorization.

3865122421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134090.

The product of its digits is 23040, while the sum is 34.

The square root of 3865122421 is about 62170.1087420635. The cubic root of 3865122421 is about 1569.3545998295.

The spelling of 3865122421 in words is "three billion, eight hundred sixty-five million, one hundred twenty-two thousand, four hundred twenty-one".