221234330021 has 12 divisors (see below), whose sum is σ = 230965974144. Its totient is φ = 211691911200.

The previous prime is 221234329991. The next prime is 221234330047. The reversal of 221234330021 is 120033432122.

It is not a de Polignac number, because 221234330021 - 2¹⁴ = 221234313637 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 (221234330081) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 204935 + ... + 696036.

It is an arithmetic number, because the mean of its divisors is an integer number (19247164512).

Almost surely, 2^221234330021 is an apocalyptic number.

It is an amenable number.

221234330021 is a deficient number, since it is larger than the sum of its proper divisors (9731644123).

221234330021 is an frugal number, since it uses more digits than its factorization.

221234330021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 901180 (or 901091 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 23.

Adding to 221234330021 its reverse (120033432122), we get a palindrome (341267762143).

The spelling of 221234330021 in words is "two hundred twenty-one billion, two hundred thirty-four million, three hundred thirty thousand, twenty-one".