21402312041321 has 4 divisors (see below), whose sum is σ = 22528749517200. Its totient is φ = 20275874565444.

The previous prime is 21402312041311. The next prime is 21402312041329. The reversal of 21402312041321 is 12314021320412.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21402312041321 is a prime.

It is a super-2 number, since 2×21402312041321² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21402312041329) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 563218737911 + ... + 563218737948.

It is an arithmetic number, because the mean of its divisors is an integer number (5632187379300).

Almost surely, 2^{21402312041321} is an apocalyptic number.

It is an amenable number.

21402312041321 is a deficient number, since it is larger than the sum of its proper divisors (1126437475879).

21402312041321 is a wasteful number, since it uses less digits than its factorization.

21402312041321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1126437475878.

The product of its (nonzero) digits is 2304, while the sum is 26.

Adding to 21402312041321 its reverse (12314021320412), we get a palindrome (33716333361733).

The spelling of 21402312041321 in words is "twenty-one trillion, four hundred two billion, three hundred twelve million, forty-one thousand, three hundred twenty-one".