21313331421 has 8 divisors (see below), whose sum is σ = 28530994464. Its totient is φ = 14152278000.

The previous prime is 21313331411. The next prime is 21313331447. The reversal of 21313331421 is 12413331312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21313331421 - 2⁷ = 21313331293 is a prime.

It is a super-2 number, since 2×21313331421² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21313331391 and 21313331400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21313331401) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14151526 + ... + 14153031.

It is an arithmetic number, because the mean of its divisors is an integer number (3566374308).

Almost surely, 2^21313331421 is an apocalyptic number.

It is an amenable number.

21313331421 is a deficient number, since it is larger than the sum of its proper divisors (7217663043).

21313331421 is a wasteful number, since it uses less digits than its factorization.

21313331421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28304811.

The product of its digits is 1296, while the sum is 24.

Adding to 21313331421 its reverse (12413331312), we get a palindrome (33726662733).

The spelling of 21313331421 in words is "twenty-one billion, three hundred thirteen million, three hundred thirty-one thousand, four hundred twenty-one".