221013345 has 32 divisors (see below), whose sum is σ = 427915008. Its totient is φ = 95090688.

The previous prime is 221013343. The next prime is 221013347. The reversal of 221013345 is 543310122.

It is an interprime number because it is at equal distance from previous prime (221013343) and next prime (221013347).

It is not a de Polignac number, because 221013345 - 2¹ = 221013343 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (221013341) 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 31 ways as a sum of consecutive naturals, for example, 60124 + ... + 63693.

It is an arithmetic number, because the mean of its divisors is an integer number (13372344).

Almost surely, 2^221013345 is an apocalyptic number.

It is an amenable number.

221013345 is a deficient number, since it is larger than the sum of its proper divisors (206901663).

221013345 is a wasteful number, since it uses less digits than its factorization.

221013345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123849.

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 221013345 is about 14866.5175814647. The cubic root of 221013345 is about 604.6065287556.

Adding to 221013345 its reverse (543310122), we get a palindrome (764323467).

The spelling of 221013345 in words is "two hundred twenty-one million, thirteen thousand, three hundred forty-five".