21016446 has 16 divisors (see below), whose sum is σ = 45854208. Its totient is φ = 6368600.

The previous prime is 21016441. The next prime is 21016459. The reversal of 21016446 is 64461012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21016441) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 159150 + ... + 159281.

It is an arithmetic number, because the mean of its divisors is an integer number (2865888).

Almost surely, 2^21016446 is an apocalyptic number.

21016446 is an abundant number, since it is smaller than the sum of its proper divisors (24837762).

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

21016446 is a wasteful number, since it uses less digits than its factorization.

21016446 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 318447.

The product of its (nonzero) digits is 1152, while the sum is 24.

The square root of 21016446 is about 4584.3697494857. The cubic root of 21016446 is about 275.9644199041.

Adding to 21016446 its reverse (64461012), we get a palindrome (85477458).

The spelling of 21016446 in words is "twenty-one million, sixteen thousand, four hundred forty-six".