21851468 has 6 divisors (see below), whose sum is σ = 38240076. Its totient is φ = 10925732.

The previous prime is 21851461. The next prime is 21851503. The reversal of 21851468 is 86415812.

It is not an unprimeable number, because it can be changed into a prime (21851461) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2731430 + ... + 2731437.

It is an arithmetic number, because the mean of its divisors is an integer number (6373346).

Almost surely, 2^21851468 is an apocalyptic number.

It is an amenable number.

21851468 is a deficient number, since it is larger than the sum of its proper divisors (16388608).

21851468 is a wasteful number, since it uses less digits than its factorization.

21851468 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5462871 (or 5462869 counting only the distinct ones).

The product of its digits is 15360, while the sum is 35.

The square root of 21851468 is about 4674.5553799265. Note that the first 3 decimals coincide. The cubic root of 21851468 is about 279.5719138688.

The spelling of 21851468 in words is "twenty-one million, eight hundred fifty-one thousand, four hundred sixty-eight".