21016028 has 12 divisors (see below), whose sum is σ = 40121592. Its totient is φ = 9552720.

The previous prime is 21016027. The next prime is 21016031. The reversal of 21016028 is 82061012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21016027) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 238775 + ... + 238862.

It is an arithmetic number, because the mean of its divisors is an integer number (3343466).

Almost surely, 2^21016028 is an apocalyptic number.

It is an amenable number.

21016028 is a deficient number, since it is larger than the sum of its proper divisors (19105564).

21016028 is a wasteful number, since it uses less digits than its factorization.

21016028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 477652 (or 477650 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 20.

The square root of 21016028 is about 4584.3241595681. The cubic root of 21016028 is about 275.9625903228.

The spelling of 21016028 in words is "twenty-one million, sixteen thousand, twenty-eight".