21221020233221 has 8 divisors (see below), whose sum is σ = 21719681801664. Its totient is φ = 20722592731680.

The previous prime is 21221020233167. The next prime is 21221020233233. The reversal of 21221020233221 is 12233202012212.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 21221020233221 - 2³⁴ = 21203840364037 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 (21221020233121) 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, 58333265 + ... + 58695926.

It is an arithmetic number, because the mean of its divisors is an integer number (2714960225208).

Almost surely, 2^{21221020233221} is an apocalyptic number.

It is an amenable number.

21221020233221 is a deficient number, since it is larger than the sum of its proper divisors (498661568443).

21221020233221 is a wasteful number, since it uses less digits than its factorization.

21221020233221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 117033451.

The product of its (nonzero) digits is 1152, while the sum is 23.

Adding to 21221020233221 its reverse (12233202012212), we get a palindrome (33454222245433).

The spelling of 21221020233221 in words is "twenty-one trillion, two hundred twenty-one billion, twenty million, two hundred thirty-three thousand, two hundred twenty-one".