221558286940 has 24 divisors (see below), whose sum is σ = 465460343712. Its totient is φ = 88587516480.

The previous prime is 221558286913. The next prime is 221558286967. The reversal of 221558286940 is 49682855122.

It is an interprime number because it is at equal distance from previous prime (221558286913) and next prime (221558286967).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2186616 + ... + 2285695.

It is an arithmetic number, because the mean of its divisors is an integer number (19394180988).

Almost surely, 2^221558286940 is an apocalyptic number.

221558286940 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221558286940 is an abundant number, since it is smaller than the sum of its proper divisors (243902056772).

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

221558286940 is a wasteful number, since it uses less digits than its factorization.

221558286940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4474797 (or 4474795 counting only the distinct ones).

The product of its (nonzero) digits is 2764800, while the sum is 52.

The spelling of 221558286940 in words is "two hundred twenty-one billion, five hundred fifty-eight million, two hundred eighty-six thousand, nine hundred forty".