21203232110221 has 8 divisors (see below), whose sum is σ = 24234735255104. Its totient is φ = 18172346461920.

The previous prime is 21203232110219. The next prime is 21203232110239. The reversal of 21203232110221 is 12201123230212.

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

It is not a de Polignac number, because 21203232110221 - 2¹ = 21203232110219 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21203232110192 and 21203232110201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21203232113221) 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, 154300560 + ... + 154437913.

It is an arithmetic number, because the mean of its divisors is an integer number (3029341906888).

Almost surely, 2^{21203232110221} is an apocalyptic number.

It is an amenable number.

21203232110221 is a deficient number, since it is larger than the sum of its proper divisors (3031503144883).

21203232110221 is an equidigital number, since it uses as much as digits as its factorization.

21203232110221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 308748291.

The product of its (nonzero) digits is 576, while the sum is 22.

Adding to 21203232110221 its reverse (12201123230212), we get a palindrome (33404355340433).

The spelling of 21203232110221 in words is "twenty-one trillion, two hundred three billion, two hundred thirty-two million, one hundred ten thousand, two hundred twenty-one".