21865348 has 6 divisors (see below), whose sum is σ = 38264366. Its totient is φ = 10932672.

The previous prime is 21865339. The next prime is 21865351. The reversal of 21865348 is 84356812.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 19201924 + 2663424 = 4382^2 + 1632^2 .

It is a super-2 number, since 2×21865348² = 956186886322208, which contains 22 as substring.

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, 2733165 + ... + 2733172.

Almost surely, 2^21865348 is an apocalyptic number.

It is an amenable number.

21865348 is a deficient number, since it is larger than the sum of its proper divisors (16399018).

21865348 is a wasteful number, since it uses less digits than its factorization.

21865348 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5466341 (or 5466339 counting only the distinct ones).

The product of its digits is 46080, while the sum is 37.

The square root of 21865348 is about 4676.0397774185. The cubic root of 21865348 is about 279.6310958093.

The spelling of 21865348 in words is "twenty-one million, eight hundred sixty-five thousand, three hundred forty-eight".