221420586 has 16 divisors (see below), whose sum is σ = 462095424. Its totient is φ = 70597824.

The previous prime is 221420579. The next prime is 221420587. The reversal of 221420586 is 685024122.

It is not an unprimeable number, because it can be changed into a prime (221420587) 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, 802111 + ... + 802386.

It is an arithmetic number, because the mean of its divisors is an integer number (28880964).

Almost surely, 2^221420586 is an apocalyptic number.

221420586 is an abundant number, since it is smaller than the sum of its proper divisors (240674838).

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

221420586 is a wasteful number, since it uses less digits than its factorization.

221420586 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1604525.

The product of its (nonzero) digits is 7680, while the sum is 30.

The square root of 221420586 is about 14880.2078614514. The cubic root of 221420586 is about 604.9776518849.

The spelling of 221420586 in words is "two hundred twenty-one million, four hundred twenty thousand, five hundred eighty-six".