21571468 has 12 divisors (see below), whose sum is σ = 37801512. Its totient is φ = 10771040.

The previous prime is 21571463. The next prime is 21571471. The reversal of 21571468 is 86417512.

It is not an unprimeable number, because it can be changed into a prime (21571463) 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, 48 + ... + 6568.

It is an arithmetic number, because the mean of its divisors is an integer number (3150126).

Almost surely, 2^21571468 is an apocalyptic number.

It is an amenable number.

21571468 is a deficient number, since it is larger than the sum of its proper divisors (16230044).

21571468 is a wasteful number, since it uses less digits than its factorization.

21571468 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7352 (or 7350 counting only the distinct ones).

The product of its digits is 13440, while the sum is 34.

The square root of 21571468 is about 4644.5094466477. The cubic root of 21571468 is about 278.3726520842.

The spelling of 21571468 in words is "twenty-one million, five hundred seventy-one thousand, four hundred sixty-eight".