221138996 has 24 divisors (see below), whose sum is σ = 430209024. Its totient is φ = 98771040.

The previous prime is 221138987. The next prime is 221138999. The reversal of 221138996 is 699831122.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221138999) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 66980 + ... + 70203.

It is an arithmetic number, because the mean of its divisors is an integer number (17925376).

Almost surely, 2^221138996 is an apocalyptic number.

221138996 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

221138996 is a deficient number, since it is larger than the sum of its proper divisors (209070028).

221138996 is a wasteful number, since it uses less digits than its factorization.

221138996 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137231 (or 137229 counting only the distinct ones).

The product of its digits is 46656, while the sum is 41.

The square root of 221138996 is about 14870.7429538675. The cubic root of 221138996 is about 604.7210844667.

The spelling of 221138996 in words is "two hundred twenty-one million, one hundred thirty-eight thousand, nine hundred ninety-six".