21448930 has 8 divisors (see below), whose sum is σ = 38608092. Its totient is φ = 8579568.

The previous prime is 21448927. The next prime is 21448957. The reversal of 21448930 is 3984412.

It can be written as a sum of positive squares in 2 ways, for example, as 17918289 + 3530641 = 4233^2 + 1879^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 21448892 and 21448901.

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 in 3 ways as a sum of consecutive naturals, for example, 1072437 + ... + 1072456.

Almost surely, 2^21448930 is an apocalyptic number.

21448930 is a deficient number, since it is larger than the sum of its proper divisors (17159162).

21448930 is a wasteful number, since it uses less digits than its factorization.

21448930 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2144900.

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 21448930 is about 4631.2989538573. The cubic root of 21448930 is about 277.8445467348.

The spelling of 21448930 in words is "twenty-one million, four hundred forty-eight thousand, nine hundred thirty".