221023340 has 12 divisors (see below), whose sum is σ = 464149056. Its totient is φ = 88409328.

The previous prime is 221023337. The next prime is 221023343. The reversal of 221023340 is 43320122.

It is an interprime number because it is at equal distance from previous prime (221023337) and next prime (221023343).

It is not an unprimeable number, because it can be changed into a prime (221023343) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 5525564 + ... + 5525603.

It is an arithmetic number, because the mean of its divisors is an integer number (38679088).

Almost surely, 2^221023340 is an apocalyptic number.

221023340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221023340 is an abundant number, since it is smaller than the sum of its proper divisors (243125716).

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

221023340 is a wasteful number, since it uses less digits than its factorization.

221023340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11051176 (or 11051174 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 17.

The square root of 221023340 is about 14866.8537357438. The cubic root of 221023340 is about 604.6156427621.

Adding to 221023340 its reverse (43320122), we get a palindrome (264343462).

The spelling of 221023340 in words is "two hundred twenty-one million, twenty-three thousand, three hundred forty".