221440443021 has 48 divisors (see below), whose sum is σ = 407426947200. Its totient is φ = 112825903104.

The previous prime is 221440443019. The next prime is 221440443023. The reversal of 221440443021 is 120344044122.

221440443021 is a `hidden beast` number, since 2 + 214 + 4 + 0 + 443 + 0 + 2 + 1 = 666.

It is an interprime number because it is at equal distance from previous prime (221440443019) and next prime (221440443023).

It is not a de Polignac number, because 221440443021 - 2¹ = 221440443019 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221440443023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 5420716 + ... + 5461413.

It is an arithmetic number, because the mean of its divisors is an integer number (8488061400).

Almost surely, 2^221440443021 is an apocalyptic number.

221440443021 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

221440443021 is a deficient number, since it is larger than the sum of its proper divisors (185986504179).

221440443021 is a wasteful number, since it uses less digits than its factorization.

221440443021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10882178 (or 10882175 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 27.

Adding to 221440443021 its reverse (120344044122), we get a palindrome (341784487143).

The spelling of 221440443021 in words is "two hundred twenty-one billion, four hundred forty million, four hundred forty-three thousand, twenty-one".