21711016 has 16 divisors (see below), whose sum is σ = 41166900. Its totient is φ = 10733184.

The previous prime is 21710993. The next prime is 21711037. The reversal of 21711016 is 61011712.

It can be written as a sum of positive squares in 2 ways, for example, as 17892900 + 3818116 = 4230^2 + 1954^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21710984 and 21711002.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14535 + ... + 15958.

Almost surely, 2^21711016 is an apocalyptic number.

It is an amenable number.

21711016 is a deficient number, since it is larger than the sum of its proper divisors (19455884).

21711016 is a wasteful number, since it uses less digits than its factorization.

21711016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30588 (or 30584 counting only the distinct ones).

The product of its (nonzero) digits is 84, while the sum is 19.

The square root of 21711016 is about 4659.5081285475. The cubic root of 21711016 is about 278.9716358844.

Adding to 21711016 its reverse (61011712), we get a palindrome (82722728).

The spelling of 21711016 in words is "twenty-one million, seven hundred eleven thousand, sixteen".