21233211031 has 2 divisors, whose sum is σ = 21233211032. Its totient is φ = 21233211030.

The previous prime is 21233211011. The next prime is 21233211061. The reversal of 21233211031 is 13011233212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21233211031 - 2²⁷ = 21098993303 is a prime.

It is a super-2 number, since 2×21233211031² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21233211011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10616605515 + 10616605516.

It is an arithmetic number, because the mean of its divisors is an integer number (10616605516).

Almost surely, 2^21233211031 is an apocalyptic number.

21233211031 is a deficient number, since it is larger than the sum of its proper divisors (1).

21233211031 is an equidigital number, since it uses as much as digits as its factorization.

21233211031 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 21233211031 its reverse (13011233212), we get a palindrome (34244444243).

The spelling of 21233211031 in words is "twenty-one billion, two hundred thirty-three million, two hundred eleven thousand, thirty-one".