21271817262 has 16 divisors (see below), whose sum is σ = 42825382272. Its totient is φ = 7043647800.

The previous prime is 21271817257. The next prime is 21271817267. The reversal of 21271817262 is 26271817212.

It is an interprime number because it is at equal distance from previous prime (21271817257) and next prime (21271817267).

It is a self number, because there is not a number n which added to its sum of digits gives 21271817262.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21271817267) 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 7 ways as a sum of consecutive naturals, for example, 11738508 + ... + 11740319.

It is an arithmetic number, because the mean of its divisors is an integer number (2676586392).

Almost surely, 2^21271817262 is an apocalyptic number.

21271817262 is an abundant number, since it is smaller than the sum of its proper divisors (21553565010).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21271817262 is a wasteful number, since it uses less digits than its factorization.

21271817262 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23478983.

The product of its digits is 37632, while the sum is 39.

The spelling of 21271817262 in words is "twenty-one billion, two hundred seventy-one million, eight hundred seventeen thousand, two hundred sixty-two".