21438652 has 6 divisors (see below), whose sum is σ = 37517648. Its totient is φ = 10719324.

The previous prime is 21438647. The next prime is 21438673. The reversal of 21438652 is 25683412.

It is a congruent number.

It is an unprimeable number.

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, 2679828 + ... + 2679835.

Almost surely, 2^21438652 is an apocalyptic number.

It is an amenable number.

21438652 is a deficient number, since it is larger than the sum of its proper divisors (16078996).

21438652 is a wasteful number, since it uses less digits than its factorization.

21438652 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5359667 (or 5359665 counting only the distinct ones).

The product of its digits is 11520, while the sum is 31.

The square root of 21438652 is about 4630.1891969983. The cubic root of 21438652 is about 277.8001600217.

The spelling of 21438652 in words is "twenty-one million, four hundred thirty-eight thousand, six hundred fifty-two".