21071548 has 12 divisors (see below), whose sum is σ = 37733080. Its totient is φ = 10290672.

The previous prime is 21071543. The next prime is 21071549. The reversal of 21071548 is 84517012.

It is a hoax number, since the sum of its digits (28) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21071543) by changing a digit.

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, 61083 + ... + 61426.

Almost surely, 2^21071548 is an apocalyptic number.

It is an amenable number.

21071548 is a deficient number, since it is larger than the sum of its proper divisors (16661532).

21071548 is a wasteful number, since it uses less digits than its factorization.

21071548 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122556 (or 122554 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 28.

The square root of 21071548 is about 4590.3755837622. The cubic root of 21071548 is about 276.2053886726.

It can be divided in two parts, 2107 and 1548, that multiplied together give a square (3261636 = 1806²).

The spelling of 21071548 in words is "twenty-one million, seventy-one thousand, five hundred forty-eight".