221231030 has 32 divisors (see below), whose sum is σ = 427602240. Its totient is φ = 82109440.

The previous prime is 221231027. The next prime is 221231033. The reversal of 221231030 is 30132122.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (221231027) and next prime (221231033).

It is a junction number, because it is equal to n+sod(n) for n = 221230996 and 221231014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221231033) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2906 + ... + 21234.

It is an arithmetic number, because the mean of its divisors is an integer number (13362570).

Almost surely, 2^221231030 is an apocalyptic number.

221231030 is a deficient number, since it is larger than the sum of its proper divisors (206371210).

221231030 is a wasteful number, since it uses less digits than its factorization.

221231030 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18424.

The product of its (nonzero) digits is 72, while the sum is 14.

The square root of 221231030 is about 14873.8370974003. The cubic root of 221231030 is about 604.8049641114.

Adding to 221231030 its reverse (30132122), we get a palindrome (251363152).

The spelling of 221231030 in words is "two hundred twenty-one million, two hundred thirty-one thousand, thirty".