21133553035373 has 2 divisors, whose sum is σ = 21133553035374. Its totient is φ = 21133553035372.

The previous prime is 21133553035351. The next prime is 21133553035453. The reversal of 21133553035373 is 37353035533112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19708077026884 + 1425476008489 = 4439378^2 + 1193933^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21133553035373 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21133553035313) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10566776517686 + 10566776517687.

It is an arithmetic number, because the mean of its divisors is an integer number (10566776517687).

Almost surely, 2^{21133553035373} is an apocalyptic number.

It is an amenable number.

21133553035373 is a deficient number, since it is larger than the sum of its proper divisors (1).

21133553035373 is an equidigital number, since it uses as much as digits as its factorization.

21133553035373 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1275750, while the sum is 44.

Adding to 21133553035373 its reverse (37353035533112), we get a palindrome (58486588568485).

The spelling of 21133553035373 in words is "twenty-one trillion, one hundred thirty-three billion, five hundred fifty-three million, thirty-five thousand, three hundred seventy-three".