21282033765 has 32 divisors (see below), whose sum is σ = 34738862976. Its totient is φ = 11122974720.

The previous prime is 21282033719. The next prime is 21282033793. The reversal of 21282033765 is 56733028212.

It is not a de Polignac number, because 21282033765 - 2¹⁰ = 21282032741 is a prime.

It is a super-2 number, since 2×21282033765² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 139105 + ... + 248825.

It is an arithmetic number, because the mean of its divisors is an integer number (1085589468).

Almost surely, 2^21282033765 is an apocalyptic number.

It is an amenable number.

21282033765 is a deficient number, since it is larger than the sum of its proper divisors (13456829211).

21282033765 is a wasteful number, since it uses less digits than its factorization.

21282033765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109989.

The product of its (nonzero) digits is 120960, while the sum is 39.

The spelling of 21282033765 in words is "twenty-one billion, two hundred eighty-two million, thirty-three thousand, seven hundred sixty-five".