21383377523 has 2 divisors, whose sum is σ = 21383377524. Its totient is φ = 21383377522.

The previous prime is 21383377481. The next prime is 21383377567. The reversal of 21383377523 is 32577338312.

It is an a-pointer prime, because the next prime (21383377567) can be obtained adding 21383377523 to its sum of digits (44).

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21383377523 is a prime.

It is a super-3 number, since 3×21383377523³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not a weakly prime, because it can be changed into another prime (21383373523) 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, 10691688761 + 10691688762.

It is an arithmetic number, because the mean of its divisors is an integer number (10691688762).

Almost surely, 2^21383377523 is an apocalyptic number.

21383377523 is a deficient number, since it is larger than the sum of its proper divisors (1).

21383377523 is an equidigital number, since it uses as much as digits as its factorization.

21383377523 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 635040, while the sum is 44.

The spelling of 21383377523 in words is "twenty-one billion, three hundred eighty-three million, three hundred seventy-seven thousand, five hundred twenty-three".