21751922511 has 48 divisors (see below), whose sum is σ = 34610284800. Its totient is φ = 13054930560.

The previous prime is 21751922477. The next prime is 21751922519. The reversal of 21751922511 is 11522915712.

21751922511 is a `hidden beast` number, since 2 + 1 + 7 + 51 + 92 + 2 + 511 = 666.

It is not a de Polignac number, because 21751922511 - 2⁷ = 21751922383 is a prime.

It is a super-2 number, since 2×21751922511² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21751922519) 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 in 47 ways as a sum of consecutive naturals, for example, 4676515 + ... + 4681163.

It is an arithmetic number, because the mean of its divisors is an integer number (721047600).

Almost surely, 2^21751922511 is an apocalyptic number.

21751922511 is a deficient number, since it is larger than the sum of its proper divisors (12858362289).

21751922511 is a wasteful number, since it uses less digits than its factorization.

21751922511 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5116 (or 5113 counting only the distinct ones).

The product of its digits is 12600, while the sum is 36.

The spelling of 21751922511 in words is "twenty-one billion, seven hundred fifty-one million, nine hundred twenty-two thousand, five hundred eleven".