221030138 has 32 divisors (see below), whose sum is σ = 396506880. Its totient is φ = 90351360.

The previous prime is 221030137. The next prime is 221030177. The reversal of 221030138 is 831030122.

It is not an unprimeable number, because it can be changed into a prime (221030137) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 147698 + ... + 149186.

It is an arithmetic number, because the mean of its divisors is an integer number (12390840).

Almost surely, 2^221030138 is an apocalyptic number.

221030138 is a deficient number, since it is larger than the sum of its proper divisors (175476742).

221030138 is a wasteful number, since it uses less digits than its factorization.

221030138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1982.

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 221030138 is about 14867.0823633960. The cubic root of 221030138 is about 604.6218414061.

The spelling of 221030138 in words is "two hundred twenty-one million, thirty thousand, one hundred thirty-eight".