221440530 has 32 divisors (see below), whose sum is σ = 532715904. Its totient is φ = 58910976.

The previous prime is 221440517. The next prime is 221440567. The reversal of 221440530 is 35044122.

It is a junction number, because it is equal to n+sod(n) for n = 221440497 and 221440506.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4467 + ... + 21513.

It is an arithmetic number, because the mean of its divisors is an integer number (16647372).

Almost surely, 2^221440530 is an apocalyptic number.

221440530 is an abundant number, since it is smaller than the sum of its proper divisors (311275374).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

221440530 is a wasteful number, since it uses less digits than its factorization.

221440530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17490.

The product of its (nonzero) digits is 960, while the sum is 21.

The square root of 221440530 is about 14880.8779982903. The cubic root of 221440530 is about 604.9958153753.

Adding to 221440530 its reverse (35044122), we get a palindrome (256484652).

The spelling of 221440530 in words is "two hundred twenty-one million, four hundred forty thousand, five hundred thirty".