221156830 has 16 divisors (see below), whose sum is σ = 398253024. Its totient is φ = 88424800.

The previous prime is 221156809. The next prime is 221156833. The reversal of 221156830 is 38651122.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221156833) 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 7 ways as a sum of consecutive naturals, for example, 38655 + ... + 44005.

It is an arithmetic number, because the mean of its divisors is an integer number (24890814).

Almost surely, 2^221156830 is an apocalyptic number.

221156830 is a deficient number, since it is larger than the sum of its proper divisors (177096194).

221156830 is a wasteful number, since it uses less digits than its factorization.

221156830 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9491.

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 221156830 is about 14871.3425755713. The cubic root of 221156830 is about 604.7373401643.

The spelling of 221156830 in words is "two hundred twenty-one million, one hundred fifty-six thousand, eight hundred thirty".