21275572436 has 12 divisors (see below), whose sum is σ = 37842616980. Its totient is φ = 10463396160.

The previous prime is 21275572433. The next prime is 21275572463. The reversal of 21275572436 is 63427557212.

It can be written as a sum of positive squares in 2 ways, for example, as 2926160836 + 18349411600 = 54094^2 + 135460^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21275572433) 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 3 ways as a sum of consecutive naturals, for example, 43597241 + ... + 43597728.

It is an arithmetic number, because the mean of its divisors is an integer number (3153551415).

Almost surely, 2^21275572436 is an apocalyptic number.

It is an amenable number.

21275572436 is a deficient number, since it is larger than the sum of its proper divisors (16567044544).

21275572436 is a wasteful number, since it uses less digits than its factorization.

21275572436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87195034 (or 87195032 counting only the distinct ones).

The product of its digits is 705600, while the sum is 44.

The spelling of 21275572436 in words is "twenty-one billion, two hundred seventy-five million, five hundred seventy-two thousand, four hundred thirty-six".