21271104751 has 16 divisors (see below), whose sum is σ = 24764706400. Its totient is φ = 18098702208.

The previous prime is 21271104737. The next prime is 21271104763. The reversal of 21271104751 is 15740117212.

It is a cyclic number.

It is not a de Polignac number, because 21271104751 - 2²³ = 21262716143 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21271104721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1154616 + ... + 1172893.

It is an arithmetic number, because the mean of its divisors is an integer number (1547794150).

Almost surely, 2^21271104751 is an apocalyptic number.

21271104751 is a deficient number, since it is larger than the sum of its proper divisors (3493601649).

21271104751 is a wasteful number, since it uses less digits than its factorization.

21271104751 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2327578.

The product of its (nonzero) digits is 3920, while the sum is 31.

The spelling of 21271104751 in words is "twenty-one billion, two hundred seventy-one million, one hundred four thousand, seven hundred fifty-one".