21161260773005 has 32 divisors (see below), whose sum is σ = 26998950205440. Its totient is φ = 15895582859520.

The previous prime is 21161260772983. The next prime is 21161260773053. The reversal of 21161260773005 is 50037706216112.

It is not a de Polignac number, because 21161260773005 - 2⁸ = 21161260772749 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8818901 + ... + 10958810.

It is an arithmetic number, because the mean of its divisors is an integer number (843717193920).

Almost surely, 2^{21161260773005} is an apocalyptic number.

It is an amenable number.

21161260773005 is a deficient number, since it is larger than the sum of its proper divisors (5837689432435).

21161260773005 is a wasteful number, since it uses less digits than its factorization.

21161260773005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19777949.

The product of its (nonzero) digits is 105840, while the sum is 41.

Adding to 21161260773005 its reverse (50037706216112), we get a palindrome (71198966989117).

The spelling of 21161260773005 in words is "twenty-one trillion, one hundred sixty-one billion, two hundred sixty million, seven hundred seventy-three thousand, five".