38072638221 has 4 divisors (see below), whose sum is σ = 50763517632. Its totient is φ = 25381758812.

The previous prime is 38072638187. The next prime is 38072638223. The reversal of 38072638221 is 12283627083.

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 38072638221 - 2²⁷ = 37938420493 is a prime.

It is a super-2 number, since 2×38072638221² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (38072638223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6345439701 + ... + 6345439706.

It is an arithmetic number, because the mean of its divisors is an integer number (12690879408).

Almost surely, 2^38072638221 is an apocalyptic number.

It is an amenable number.

38072638221 is a deficient number, since it is larger than the sum of its proper divisors (12690879411).

38072638221 is a wasteful number, since it uses less digits than its factorization.

38072638221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12690879410.

The product of its (nonzero) digits is 193536, while the sum is 42.

The spelling of 38072638221 in words is "thirty-eight billion, seventy-two million, six hundred thirty-eight thousand, two hundred twenty-one".