9638042221 has 4 divisors (see below), whose sum is σ = 9639115200. Its totient is φ = 9636969244.

The previous prime is 9638042189. The next prime is 9638042233. The reversal of 9638042221 is 1222408369.

It is a happy number.

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 9638042221 - 2⁵ = 9638042189 is a prime.

It is a super-2 number, since 2×9638042221² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9638042251) 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, 522901 + ... + 541018.

It is an arithmetic number, because the mean of its divisors is an integer number (2409778800).

Almost surely, 2^9638042221 is an apocalyptic number.

It is an amenable number.

9638042221 is a deficient number, since it is larger than the sum of its proper divisors (1072979).

9638042221 is a wasteful number, since it uses less digits than its factorization.

9638042221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1072978.

The product of its (nonzero) digits is 41472, while the sum is 37.

The square root of 9638042221 is about 98173.5311629362. The cubic root of 9638042221 is about 2128.1207918654.

It can be divided in two parts, 96380 and 42221, that added together give a triangular number (138601 = T₅₂₆).

The spelling of 9638042221 in words is "nine billion, six hundred thirty-eight million, forty-two thousand, two hundred twenty-one".