21211131331 has 8 divisors (see below), whose sum is σ = 22917167504. Its totient is φ = 19515725280.

The previous prime is 21211131311. The next prime is 21211131343. The reversal of 21211131331 is 13313111212.

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 21211131331 - 2⁵ = 21211131299 is a prime.

It is a super-2 number, since 2×21211131331² (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 = 21211131299 and 21211131308.

It is not an unprimeable number, because it can be changed into a prime (21211131311) 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, 2653380 + ... + 2661361.

It is an arithmetic number, because the mean of its divisors is an integer number (2864645938).

Almost surely, 2^21211131331 is an apocalyptic number.

21211131331 is a deficient number, since it is larger than the sum of its proper divisors (1706036173).

21211131331 is a wasteful number, since it uses less digits than its factorization.

21211131331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5315061.

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

Adding to 21211131331 its reverse (13313111212), we get a palindrome (34524242543).

The spelling of 21211131331 in words is "twenty-one billion, two hundred eleven million, one hundred thirty-one thousand, three hundred thirty-one".