21574116 has 18 divisors (see below), whose sum is σ = 54534662. Its totient is φ = 7191360.

The previous prime is 21574087. The next prime is 21574129. The reversal of 21574116 is 61147512.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 12574116 + 9000000 = 3546^2 + 3000^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a self number, because there is not a number n which added to its sum of digits gives 21574116.

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 5 ways as a sum of consecutive naturals, for example, 299605 + ... + 299676.

Almost surely, 2^21574116 is an apocalyptic number.

It is an amenable number.

21574116 is an abundant number, since it is smaller than the sum of its proper divisors (32960546).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21574116 is a wasteful number, since it uses less digits than its factorization.

21574116 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 599291 (or 599286 counting only the distinct ones).

The product of its digits is 1680, while the sum is 27.

The square root of 21574116 is about 4644.7945056805. The cubic root of 21574116 is about 278.3840421392.

The spelling of 21574116 in words is "twenty-one million, five hundred seventy-four thousand, one hundred sixteen".