21261276571403 has 16 divisors (see below), whose sum is σ = 23233036010496. Its totient is φ = 19296006092640.

The previous prime is 21261276571397. The next prime is 21261276571417. The reversal of 21261276571403 is 30417567216212.

It is a cyclic number.

It is not a de Polignac number, because 21261276571403 - 2⁸ = 21261276571147 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21261276571453) 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, 176788550 + ... + 176908772.

It is an arithmetic number, because the mean of its divisors is an integer number (1452064750656).

Almost surely, 2^{21261276571403} is an apocalyptic number.

21261276571403 is a deficient number, since it is larger than the sum of its proper divisors (1971759439093).

21261276571403 is a wasteful number, since it uses less digits than its factorization.

21261276571403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 147074.

The product of its (nonzero) digits is 846720, while the sum is 47.

The spelling of 21261276571403 in words is "twenty-one trillion, two hundred sixty-one billion, two hundred seventy-six million, five hundred seventy-one thousand, four hundred three".