21133231373 has 2 divisors, whose sum is σ = 21133231374. Its totient is φ = 21133231372.

The previous prime is 21133231367. The next prime is 21133231421. The reversal of 21133231373 is 37313233112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16280994409 + 4852236964 = 127597^2 + 69658^2 .

It is a cyclic number.

It is not a de Polignac number, because 21133231373 - 2⁸ = 21133231117 is a prime.

It is a super-2 number, since 2×21133231373² (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 (21133237373) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10566615686 + 10566615687.

It is an arithmetic number, because the mean of its divisors is an integer number (10566615687).

Almost surely, 2^21133231373 is an apocalyptic number.

It is an amenable number.

21133231373 is a deficient number, since it is larger than the sum of its proper divisors (1).

21133231373 is an equidigital number, since it uses as much as digits as its factorization.

21133231373 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6804, while the sum is 29.

Adding to 21133231373 its reverse (37313233112), we get a palindrome (58446464485).

The spelling of 21133231373 in words is "twenty-one billion, one hundred thirty-three million, two hundred thirty-one thousand, three hundred seventy-three".