21250933733 has 2 divisors, whose sum is σ = 21250933734. Its totient is φ = 21250933732.

The previous prime is 21250933681. The next prime is 21250933771. The reversal of 21250933733 is 33733905212.

It is an a-pointer prime, because the next prime (21250933771) can be obtained adding 21250933733 to its sum of digits (38).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21250933729 + 4 = 145777^2 + 2^2 .

It is a cyclic number.

It is not a de Polignac number, because 21250933733 - 2¹⁰ = 21250932709 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21250933633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10625466866 + 10625466867.

It is an arithmetic number, because the mean of its divisors is an integer number (10625466867).

Almost surely, 2^21250933733 is an apocalyptic number.

It is an amenable number.

21250933733 is a deficient number, since it is larger than the sum of its proper divisors (1).

21250933733 is an equidigital number, since it uses as much as digits as its factorization.

21250933733 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 102060, while the sum is 38.

The spelling of 21250933733 in words is "twenty-one billion, two hundred fifty million, nine hundred thirty-three thousand, seven hundred thirty-three".