221332010021 has 18 divisors (see below), whose sum is σ = 239153650470. Its totient is φ = 204805991376.

The previous prime is 221332009993. The next prime is 221332010023. The reversal of 221332010021 is 120010233122.

It can be written as a sum of positive squares in only one way, i.e., 123418716100 + 97913293921 = 351310^2 + 312911^2 .

It is not a de Polignac number, because 221332010021 - 2²² = 221327815717 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221332010023) 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 17 ways as a sum of consecutive naturals, for example, 501695 + ... + 833283.

It is an arithmetic number, because the mean of its divisors is an integer number (13286313915).

Almost surely, 2^221332010021 is an apocalyptic number.

It is an amenable number.

221332010021 is a deficient number, since it is larger than the sum of its proper divisors (17821640449).

221332010021 is an equidigital number, since it uses as much as digits as its factorization.

221332010021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 331713 (or 331651 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 221332010021 its reverse (120010233122), we get a palindrome (341342243143).

The spelling of 221332010021 in words is "two hundred twenty-one billion, three hundred thirty-two million, ten thousand, twenty-one".