21312230133321 has 6 divisors (see below), whose sum is σ = 30784332414810. Its totient is φ = 14208153422208.

The previous prime is 21312230133283. The next prime is 21312230133323. The reversal of 21312230133321 is 12333103221312.

21312230133321 is a `hidden beast` number, since 2 + 1 + 3 + 1 + 2 + 2 + 301 + 33 + 321 = 666.

It can be written as a sum of positive squares in only one way, i.e., 21079448007696 + 232782125625 = 4591236^2 + 482475^2 .

It is not a de Polignac number, because 21312230133321 - 2¹¹ = 21312230131273 is a prime.

It is a super-2 number, since 2×21312230133321² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21312230133323) 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, 1184012785176 + ... + 1184012785193.

It is an arithmetic number, because the mean of its divisors is an integer number (5130722069135).

Almost surely, 2^{21312230133321} is an apocalyptic number.

It is an amenable number.

21312230133321 is a deficient number, since it is larger than the sum of its proper divisors (9472102281489).

21312230133321 is a wasteful number, since it uses less digits than its factorization.

21312230133321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2368025570375 (or 2368025570372 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 27.

Adding to 21312230133321 its reverse (12333103221312), we get a palindrome (33645333354633).

The spelling of 21312230133321 in words is "twenty-one trillion, three hundred twelve billion, two hundred thirty million, one hundred thirty-three thousand, three hundred twenty-one".