21311200133221 has 8 divisors (see below), whose sum is σ = 21874952780640. Its totient is φ = 20754199014768.

The previous prime is 21311200133183. The next prime is 21311200133233. The reversal of 21311200133221 is 12233100211312.

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 21311200133221 - 2⁹ = 21311200132709 is a prime.

It is a super-2 number, since 2×21311200133221² (a number of 27 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 = 21311200133192 and 21311200133201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21311200133261) 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 7 ways as a sum of consecutive naturals, for example, 1687875846 + ... + 1687888471.

It is an arithmetic number, because the mean of its divisors is an integer number (2734369097580).

Almost surely, 2^{21311200133221} is an apocalyptic number.

It is an amenable number.

21311200133221 is a deficient number, since it is larger than the sum of its proper divisors (563752647419).

21311200133221 is a wasteful number, since it uses less digits than its factorization.

21311200133221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3375764483.

The product of its (nonzero) digits is 432, while the sum is 22.

Adding to 21311200133221 its reverse (12233100211312), we get a palindrome (33544300344533).

The spelling of 21311200133221 in words is "twenty-one trillion, three hundred eleven billion, two hundred million, one hundred thirty-three thousand, two hundred twenty-one".