221332031421 has 8 divisors (see below), whose sum is σ = 295111610304. Its totient is φ = 147553570080.

The previous prime is 221332031381. The next prime is 221332031441. The reversal of 221332031421 is 124130233122.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 221332031421 - 2¹⁰ = 221332030397 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 221332031391 and 221332031400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221332031441) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 469536 + ... + 814326.

It is an arithmetic number, because the mean of its divisors is an integer number (36888951288).

Almost surely, 2^221332031421 is an apocalyptic number.

It is an amenable number.

221332031421 is a deficient number, since it is larger than the sum of its proper divisors (73779578883).

221332031421 is a wasteful number, since it uses less digits than its factorization.

221332031421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 558771.

The product of its (nonzero) digits is 1728, while the sum is 24.

Adding to 221332031421 its reverse (124130233122), we get a palindrome (345462264543).

The spelling of 221332031421 in words is "two hundred twenty-one billion, three hundred thirty-two million, thirty-one thousand, four hundred twenty-one".