21352016 has 40 divisors (see below), whose sum is σ = 47508864. Its totient is φ = 9106560.

The previous prime is 21352007. The next prime is 21352031. The reversal of 21352016 is 61025312.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34526 + ... + 35138.

Almost surely, 2^21352016 is an apocalyptic number.

It is an amenable number.

21352016 is an abundant number, since it is smaller than the sum of its proper divisors (26156848).

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

21352016 is a wasteful number, since it uses less digits than its factorization.

21352016 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 939 (or 933 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 21352016 is about 4620.8241689119. The cubic root of 21352016 is about 277.4254476025.

Adding to 21352016 its reverse (61025312), we get a palindrome (82377328).

The spelling of 21352016 in words is "twenty-one million, three hundred fifty-two thousand, sixteen".