21565414 has 12 divisors (see below), whose sum is σ = 35028396. Its totient is φ = 9953112.

The previous prime is 21565409. The next prime is 21565417. The reversal of 21565414 is 41456512.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21565417) 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 in 5 ways as a sum of consecutive naturals, for example, 31564 + ... + 32239.

It is an arithmetic number, because the mean of its divisors is an integer number (2919033).

Almost surely, 2^21565414 is an apocalyptic number.

21565414 is a deficient number, since it is larger than the sum of its proper divisors (13462982).

21565414 is a wasteful number, since it uses less digits than its factorization.

21565414 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63831 (or 63818 counting only the distinct ones).

The product of its digits is 4800, while the sum is 28.

The square root of 21565414 is about 4643.8576636241. The cubic root of 21565414 is about 278.3466080258.

The spelling of 21565414 in words is "twenty-one million, five hundred sixty-five thousand, four hundred fourteen".