21233122201221 has 16 divisors (see below), whose sum is σ = 32451243437184. Its totient is φ = 12097209083904.

The previous prime is 21233122201211. The next prime is 21233122201223. The reversal of 21233122201221 is 12210222133212.

It is not a de Polignac number, because 21233122201221 - 2⁶ = 21233122201157 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21233122201191 and 21233122201200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21233122201223) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1500142860 + ... + 1500157013.

It is an arithmetic number, because the mean of its divisors is an integer number (2028202714824).

Almost surely, 2^{21233122201221} is an apocalyptic number.

21233122201221 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

21233122201221 is a deficient number, since it is larger than the sum of its proper divisors (11218121235963).

21233122201221 is a wasteful number, since it uses less digits than its factorization.

21233122201221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3000300220.

The product of its (nonzero) digits is 1152, while the sum is 24.

Adding to 21233122201221 its reverse (12210222133212), we get a palindrome (33443344334433).

The spelling of 21233122201221 in words is "twenty-one trillion, two hundred thirty-three billion, one hundred twenty-two million, two hundred one thousand, two hundred twenty-one".