21878034466775 has 12 divisors (see below), whose sum is σ = 27129114907512. Its totient is φ = 17502200367840.

The previous prime is 21878034466727. The next prime is 21878034466789. The reversal of 21878034466775 is 57766443087812.

It is a de Polignac number, because none of the positive numbers 2^k-21878034466775 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3702284 + ... + 7580433.

It is an arithmetic number, because the mean of its divisors is an integer number (2260759575626).

Almost surely, 2^{21878034466775} is an apocalyptic number.

21878034466775 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21878034466775 is a deficient number, since it is larger than the sum of its proper divisors (5251080440737).

21878034466775 is a wasteful number, since it uses less digits than its factorization.

21878034466775 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11360290 (or 11360285 counting only the distinct ones).

The product of its (nonzero) digits is 379330560, while the sum is 68.

The spelling of 21878034466775 in words is "twenty-one trillion, eight hundred seventy-eight billion, thirty-four million, four hundred sixty-six thousand, seven hundred seventy-five".