21361016 has 16 divisors (see below), whose sum is σ = 42160200. Its totient is φ = 10118304.

The previous prime is 21361013. The next prime is 21361031. The reversal of 21361016 is 61016312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21361013) 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 3 ways as a sum of consecutive naturals, for example, 70115 + ... + 70418.

Almost surely, 2^21361016 is an apocalyptic number.

It is an amenable number.

21361016 is a deficient number, since it is larger than the sum of its proper divisors (20799184).

21361016 is a wasteful number, since it uses less digits than its factorization.

21361016 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140558 (or 140554 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 20.

The square root of 21361016 is about 4621.7979185594. The cubic root of 21361016 is about 277.4644209451.

Adding to 21361016 its reverse (61016312), we get a palindrome (82377328).

The spelling of 21361016 in words is "twenty-one million, three hundred sixty-one thousand, sixteen".