21275266371 has 16 divisors (see below), whose sum is σ = 28673283744. Its totient is φ = 14030521344.

The previous prime is 21275266343. The next prime is 21275266379. The reversal of 21275266371 is 17366257212.

It is not a de Polignac number, because 21275266371 - 2¹¹ = 21275264323 is a prime.

It is a super-3 number, since 3×21275266371³ (a number of 32 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (21275266379) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 627465 + ... + 660501.

It is an arithmetic number, because the mean of its divisors is an integer number (1792080234).

Almost surely, 2^21275266371 is an apocalyptic number.

21275266371 is a deficient number, since it is larger than the sum of its proper divisors (7398017373).

21275266371 is a wasteful number, since it uses less digits than its factorization.

21275266371 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35350.

The product of its digits is 211680, while the sum is 42.

The spelling of 21275266371 in words is "twenty-one billion, two hundred seventy-five million, two hundred sixty-six thousand, three hundred seventy-one".