21385048 has 16 divisors (see below), whose sum is σ = 42455880. Its totient is φ = 10063488.

The previous prime is 21384991. The next prime is 21385057. The reversal of 21385048 is 84058312.

It is a plaindrome in base 13.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 78486 + ... + 78757.

Almost surely, 2^21385048 is an apocalyptic number.

It is an amenable number.

21385048 is a deficient number, since it is larger than the sum of its proper divisors (21070832).

21385048 is a wasteful number, since it uses less digits than its factorization.

21385048 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 157266 (or 157262 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 31.

The square root of 21385048 is about 4624.3970417774. The cubic root of 21385048 is about 277.5684348167.

The spelling of 21385048 in words is "twenty-one million, three hundred eighty-five thousand, forty-eight".