221042764 has 6 divisors (see below), whose sum is σ = 386824844. Its totient is φ = 110521380.

The previous prime is 221042761. The next prime is 221042777. The reversal of 221042764 is 467240122.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (221042761) 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 as a sum of consecutive naturals, namely, 27630342 + ... + 27630349.

Almost surely, 2^221042764 is an apocalyptic number.

It is an amenable number.

221042764 is a deficient number, since it is larger than the sum of its proper divisors (165782080).

221042764 is a wasteful number, since it uses less digits than its factorization.

221042764 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55260695 (or 55260693 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 28.

The square root of 221042764 is about 14867.5069867143. The cubic root of 221042764 is about 604.6333538783.

Adding to 221042764 its reverse (467240122), we get a palindrome (688282886).

The spelling of 221042764 in words is "two hundred twenty-one million, forty-two thousand, seven hundred sixty-four".