21943336 has 8 divisors (see below), whose sum is σ = 41143770. Its totient is φ = 10971664.

The previous prime is 21943333. The next prime is 21943351. The reversal of 21943336 is 63334912.

It can be written as a sum of positive squares in only one way, i.e., 13003236 + 8940100 = 3606^2 + 2990^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 21943298 and 21943307.

It is not an unprimeable number, because it can be changed into a prime (21943333) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1371451 + ... + 1371466.

Almost surely, 2^21943336 is an apocalyptic number.

It is an amenable number.

21943336 is a deficient number, since it is larger than the sum of its proper divisors (19200434).

21943336 is a wasteful number, since it uses less digits than its factorization.

21943336 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2742923 (or 2742919 counting only the distinct ones).

The product of its digits is 11664, while the sum is 31.

The square root of 21943336 is about 4684.3714626404. The cubic root of 21943336 is about 279.9631584180.

The spelling of 21943336 in words is "twenty-one million, nine hundred forty-three thousand, three hundred thirty-six".