21133443131 has 2 divisors, whose sum is σ = 21133443132. Its totient is φ = 21133443130.

The previous prime is 21133443061. The next prime is 21133443137. The reversal of 21133443131 is 13134433112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21133443131 - 2¹⁸ = 21133180987 is a prime.

It is a super-2 number, since 2×21133443131² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21133443131.

It is not a weakly prime, because it can be changed into another prime (21133443137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10566721565 + 10566721566.

It is an arithmetic number, because the mean of its divisors is an integer number (10566721566).

Almost surely, 2^21133443131 is an apocalyptic number.

21133443131 is a deficient number, since it is larger than the sum of its proper divisors (1).

21133443131 is an equidigital number, since it uses as much as digits as its factorization.

21133443131 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2592, while the sum is 26.

Adding to 21133443131 its reverse (13134433112), we get a palindrome (34267876243).

The spelling of 21133443131 in words is "twenty-one billion, one hundred thirty-three million, four hundred forty-three thousand, one hundred thirty-one".