221020064 has 24 divisors (see below), whose sum is σ = 454053600. Its totient is φ = 105704896.

The previous prime is 221020057. The next prime is 221020067. The reversal of 221020064 is 460020122.

It is not an unprimeable number, because it can be changed into a prime (221020067) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 149414 + ... + 150885.

It is an arithmetic number, because the mean of its divisors is an integer number (18918900).

Almost surely, 2^221020064 is an apocalyptic number.

It is an amenable number.

221020064 is an abundant number, since it is smaller than the sum of its proper divisors (233033536).

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

221020064 is a wasteful number, since it uses less digits than its factorization.

221020064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 300332 (or 300324 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 221020064 is about 14866.7435573497. The cubic root of 221020064 is about 604.6126555502.

Adding to 221020064 its reverse (460020122), we get a palindrome (681040186).

The spelling of 221020064 in words is "two hundred twenty-one million, twenty thousand, sixty-four".