21162826755 has 24 divisors (see below), whose sum is σ = 41922552672. Its totient is φ = 9674434944.

The previous prime is 21162826697. The next prime is 21162826813. The reversal of 21162826755 is 55762826112.

21162826755 is a `hidden beast` number, since 2 + 11 + 628 + 2 + 6 + 7 + 5 + 5 = 666.

It is an interprime number because it is at equal distance from previous prime (21162826697) and next prime (21162826813).

It is not a de Polignac number, because 21162826755 - 2¹⁸ = 21162564611 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 21162826755.

It is an unprimeable number.

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 in 23 ways as a sum of consecutive naturals, for example, 33591474 + ... + 33592103.

It is an arithmetic number, because the mean of its divisors is an integer number (1746773028).

Almost surely, 2^21162826755 is an apocalyptic number.

21162826755 is a deficient number, since it is larger than the sum of its proper divisors (20759725917).

21162826755 is a wasteful number, since it uses less digits than its factorization.

21162826755 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67183595 (or 67183592 counting only the distinct ones).

The product of its digits is 403200, while the sum is 45.

The spelling of 21162826755 in words is "twenty-one billion, one hundred sixty-two million, eight hundred twenty-six thousand, seven hundred fifty-five".