21233101221 has 6 divisors (see below), whose sum is σ = 30670035110. Its totient is φ = 14155400808.

The previous prime is 21233101159. The next prime is 21233101223. The reversal of 21233101221 is 12210133212.

21233101221 is a `hidden beast` number, since 212 + 331 + 0 + 122 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 21091752900 + 141348321 = 145230^2 + 11889^2 .

It is not a de Polignac number, because 21233101221 - 2⁷ = 21233101093 is a prime.

It is a super-2 number, since 2×21233101221² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21233101194 and 21233101203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21233101223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1179616726 + ... + 1179616743.

Almost surely, 2^21233101221 is an apocalyptic number.

It is an amenable number.

21233101221 is a deficient number, since it is larger than the sum of its proper divisors (9436933889).

21233101221 is a wasteful number, since it uses less digits than its factorization.

21233101221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2359233475 (or 2359233472 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 21233101221 its reverse (12210133212), we get a palindrome (33443234433).

The spelling of 21233101221 in words is "twenty-one billion, two hundred thirty-three million, one hundred one thousand, two hundred twenty-one".