21213111331 has 8 divisors (see below), whose sum is σ = 21360646944. Its totient is φ = 21065668800.

The previous prime is 21213111329. The next prime is 21213111341. The reversal of 21213111331 is 13311131212.

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 21213111331 - 2¹ = 21213111329 is a prime.

It is a super-2 number, since 2×21213111331² (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 = 21213111299 and 21213111308.

It is not an unprimeable number, because it can be changed into a prime (21213111341) 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, 470241 + ... + 513373.

It is an arithmetic number, because the mean of its divisors is an integer number (2670080868).

Almost surely, 2^21213111331 is an apocalyptic number.

21213111331 is a deficient number, since it is larger than the sum of its proper divisors (147535613).

21213111331 is a wasteful number, since it uses less digits than its factorization.

21213111331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46541.

The product of its digits is 108, while the sum is 19.

Adding to 21213111331 its reverse (13311131212), we get a palindrome (34524242543).

The spelling of 21213111331 in words is "twenty-one billion, two hundred thirteen million, one hundred eleven thousand, three hundred thirty-one".