21233131211 has 8 divisors (see below), whose sum is σ = 21316938384. Its totient is φ = 21149483040.

The previous prime is 21233131187. The next prime is 21233131261. The reversal of 21233131211 is 11213133212.

It is a happy number.

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 21233131211 - 2⁶ = 21233131147 is a prime.

It is a super-2 number, since 2×21233131211² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21233131261) 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, 231485 + ... + 309921.

It is an arithmetic number, because the mean of its divisors is an integer number (2664617298).

Almost surely, 2^21233131211 is an apocalyptic number.

21233131211 is a deficient number, since it is larger than the sum of its proper divisors (83807173).

21233131211 is an equidigital number, since it uses as much as digits as its factorization.

21233131211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79501.

The product of its digits is 216, while the sum is 20.

Adding to 21233131211 its reverse (11213133212), we get a palindrome (32446264423).

The spelling of 21233131211 in words is "twenty-one billion, two hundred thirty-three million, one hundred thirty-one thousand, two hundred eleven".