988238221 has 4 divisors (see below), whose sum is σ = 989261152. Its totient is φ = 987215292.

The previous prime is 988238161. The next prime is 988238257. The reversal of 988238221 is 122832889.

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 an emirpimes, since its reverse is a distinct semiprime: 122832889 = 11083².

It is a cyclic number.

It is not a de Polignac number, because 988238221 - 2¹⁷ = 988107149 is a prime.

It is a super-2 number, since 2×988238221² = 1953229562890489682, which 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 (988238281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 510015 + ... + 511948.

It is an arithmetic number, because the mean of its divisors is an integer number (247315288).

Almost surely, 2^988238221 is an apocalyptic number.

It is an amenable number.

988238221 is a deficient number, since it is larger than the sum of its proper divisors (1022931).

988238221 is a wasteful number, since it uses less digits than its factorization.

988238221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1022930.

The product of its digits is 110592, while the sum is 43.

The square root of 988238221 is about 31436.2564724237. The cubic root of 988238221 is about 996.0639347167.

The spelling of 988238221 in words is "nine hundred eighty-eight million, two hundred thirty-eight thousand, two hundred twenty-one".