21016410 has 32 divisors (see below), whose sum is σ = 50594112. Its totient is φ = 5587200.

The previous prime is 21016409. The next prime is 21016417. The reversal of 21016410 is 1461012.

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

It is a zygodrome in base 4.

It is a self number, because there is not a number n which added to its sum of digits gives 21016410.

It is not an unprimeable number, because it can be changed into a prime (21016417) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11157 + ... + 12903.

It is an arithmetic number, because the mean of its divisors is an integer number (1581066).

Almost surely, 2^21016410 is an apocalyptic number.

21016410 is an abundant number, since it is smaller than the sum of its proper divisors (29577702).

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

21016410 is a wasteful number, since it uses less digits than its factorization.

21016410 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2158.

The product of its (nonzero) digits is 48, while the sum is 15.

The square root of 21016410 is about 4584.3658230992. The cubic root of 21016410 is about 275.9642623335.

Adding to 21016410 its reverse (1461012), we get a palindrome (22477422).

The spelling of 21016410 in words is "twenty-one million, sixteen thousand, four hundred ten".