221369568 has 48 divisors (see below), whose sum is σ = 664110720. Its totient is φ = 63248256.

The previous prime is 221369539. The next prime is 221369569. The reversal of 221369568 is 865963122.

It is a tau number, because it is divible by the number of its divisors (48).

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221369569) 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 7 ways as a sum of consecutive naturals, for example, 164038 + ... + 165381.

It is an arithmetic number, because the mean of its divisors is an integer number (13835640).

Almost surely, 2^221369568 is an apocalyptic number.

221369568 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

221369568 is an abundant number, since it is smaller than the sum of its proper divisors (442741152).

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

221369568 is a wasteful number, since it uses less digits than its factorization.

221369568 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 329439 (or 329431 counting only the distinct ones).

The product of its digits is 155520, while the sum is 42.

The square root of 221369568 is about 14878.4934721228. The cubic root of 221369568 is about 604.9311835758.

The spelling of 221369568 in words is "two hundred twenty-one million, three hundred sixty-nine thousand, five hundred sixty-eight".