221020364 has 6 divisors (see below), whose sum is σ = 386785644. Its totient is φ = 110510180.

The previous prime is 221020357. The next prime is 221020379. The reversal of 221020364 is 463020122.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27627542 + ... + 27627549.

It is an arithmetic number, because the mean of its divisors is an integer number (64464274).

Almost surely, 2^221020364 is an apocalyptic number.

It is an amenable number.

221020364 is a deficient number, since it is larger than the sum of its proper divisors (165765280).

221020364 is a wasteful number, since it uses less digits than its factorization.

221020364 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55255095 (or 55255093 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 221020364 is about 14866.7536469802. The cubic root of 221020364 is about 604.6129291056.

Adding to 221020364 its reverse (463020122), we get a palindrome (684040486).

The spelling of 221020364 in words is "two hundred twenty-one million, twenty thousand, three hundred sixty-four".