21016050 has 96 divisors (see below), whose sum is σ = 58281984. Its totient is φ = 4968000.

The previous prime is 21016049. The next prime is 21016057. The reversal of 21016050 is 5061012.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is not an unprimeable number, because it can be changed into a prime (21016057) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 77415 + ... + 77685.

It is an arithmetic number, because the mean of its divisors is an integer number (607104).

Almost surely, 2^21016050 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21016050, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29140992).

21016050 is an abundant number, since it is smaller than the sum of its proper divisors (37265934).

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

21016050 is a wasteful number, since it uses less digits than its factorization.

21016050 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 344 (or 339 counting only the distinct ones).

The product of its (nonzero) digits is 60, while the sum is 15.

The square root of 21016050 is about 4584.3265590488. The cubic root of 21016050 is about 275.9626866171.

Adding to 21016050 its reverse (5061012), we get a palindrome (26077062).

The spelling of 21016050 in words is "twenty-one million, sixteen thousand, fifty".