21711416 has 16 divisors (see below), whose sum is σ = 41021640. Its totient is φ = 10772320.

The previous prime is 21711331. The next prime is 21711419. The reversal of 21711416 is 61411712.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21711391 and 21711400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21711419) 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, 9311 + ... + 11406.

Almost surely, 2^21711416 is an apocalyptic number.

It is an amenable number.

21711416 is a deficient number, since it is larger than the sum of its proper divisors (19310224).

21711416 is a wasteful number, since it uses less digits than its factorization.

21711416 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20854 (or 20850 counting only the distinct ones).

The product of its digits is 336, while the sum is 23.

The square root of 21711416 is about 4659.5510513353. The cubic root of 21711416 is about 278.9733491156.

The spelling of 21711416 in words is "twenty-one million, seven hundred eleven thousand, four hundred sixteen".