21835016 has 16 divisors (see below), whose sum is σ = 46789440. Its totient is φ = 9357840.

The previous prime is 21835007. The next prime is 21835019. The reversal of 21835016 is 61053812.

21835016 is nontrivially palindromic in base 6.

It is not an unprimeable number, because it can be changed into a prime (21835019) 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, 194900 + ... + 195011.

It is an arithmetic number, because the mean of its divisors is an integer number (2924340).

Almost surely, 2^21835016 is an apocalyptic number.

It is an amenable number.

21835016 is an abundant number, since it is smaller than the sum of its proper divisors (24954424).

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

21835016 is a wasteful number, since it uses less digits than its factorization.

21835016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 389924 (or 389920 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 26.

The square root of 21835016 is about 4672.7953090201. The cubic root of 21835016 is about 279.5017328946.

Adding to 21835016 its reverse (61053812), we get a palindrome (82888828).

Subtracting 21835016 from its reverse (61053812), we obtain a triangular number (39218796 = T₈₈₅₆).

The spelling of 21835016 in words is "twenty-one million, eight hundred thirty-five thousand, sixteen".