6138221 has 4 divisors (see below), whose sum is σ = 6216000. Its totient is φ = 6060444.

The previous prime is 6138211. The next prime is 6138239. The reversal of 6138221 is 1228316.

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.

It is a cyclic number.

It is not a de Polignac number, because 6138221 - 2¹⁸ = 5876077 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6138211) 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, 38771 + ... + 38928.

It is an arithmetic number, because the mean of its divisors is an integer number (1554000).

Almost surely, 2^6138221 is an apocalyptic number.

It is an amenable number.

6138221 is a deficient number, since it is larger than the sum of its proper divisors (77779).

6138221 is an equidigital number, since it uses as much as digits as its factorization.

6138221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77778.

The product of its digits is 576, while the sum is 23.

The square root of 6138221 is about 2477.5433396815. The cubic root of 6138221 is about 183.0968362843.

The spelling of 6138221 in words is "six million, one hundred thirty-eight thousand, two hundred twenty-one".