21338132 has 6 divisors (see below), whose sum is σ = 37341738. Its totient is φ = 10669064.

The previous prime is 21338131. The next prime is 21338143. The reversal of 21338132 is 23183312.

It can be written as a sum of positive squares in only one way, i.e., 15007876 + 6330256 = 3874^2 + 2516^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21338098 and 21338107.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21338131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2667263 + ... + 2667270.

It is an arithmetic number, because the mean of its divisors is an integer number (6223623).

Almost surely, 2^21338132 is an apocalyptic number.

It is an amenable number.

21338132 is a deficient number, since it is larger than the sum of its proper divisors (16003606).

21338132 is a wasteful number, since it uses less digits than its factorization.

21338132 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5334537 (or 5334535 counting only the distinct ones).

The product of its digits is 864, while the sum is 23.

The square root of 21338132 is about 4619.3215952129. The cubic root of 21338132 is about 277.3653032415.

The spelling of 21338132 in words is "twenty-one million, three hundred thirty-eight thousand, one hundred thirty-two".