21100016 has 40 divisors (see below), whose sum is σ = 48758784. Its totient is φ = 8648640.

The previous prime is 21100007. The next prime is 21100019. The reversal of 21100016 is 61000112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21100019) 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 7 ways as a sum of consecutive naturals, for example, 1520 + ... + 6671.

Almost surely, 2^21100016 is an apocalyptic number.

It is an amenable number.

21100016 is an abundant number, since it is smaller than the sum of its proper divisors (27658768).

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

21100016 is a wasteful number, since it uses less digits than its factorization.

21100016 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8229 (or 8223 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 11.

The square root of 21100016 is about 4593.4753727434. The cubic root of 21100016 is about 276.3297186718.

Adding to 21100016 its reverse (61000112), we get a palindrome (82100128).

The spelling of 21100016 in words is "twenty-one million, one hundred thousand, sixteen".