21843066436 has 9 divisors (see below), whose sum is σ = 38225883549. Its totient is φ = 10921385424.

The previous prime is 21843066431. The next prime is 21843066451. The reversal of 21843066436 is 63466034812.

The square root of 21843066436 is 147794.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 15547596100 + 6295470336 = 124690^2 + 79344^2 .

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21843066392 and 21843066401.

It is not an unprimeable number, because it can be changed into a prime (21843066431) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 258640 + ... + 332536.

Almost surely, 2^21843066436 is an apocalyptic number.

21843066436 is the 147794-th square number.

It is an amenable number.

21843066436 is a deficient number, since it is larger than the sum of its proper divisors (16382817113).

21843066436 is an frugal number, since it uses more digits than its factorization.

21843066436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 147798 (or 73899 counting only the distinct ones).

The product of its (nonzero) digits is 497664, while the sum is 43.

The spelling of 21843066436 in words is "twenty-one billion, eight hundred forty-three million, sixty-six thousand, four hundred thirty-six".