21011376 has 40 divisors (see below), whose sum is σ = 54800064. Its totient is φ = 6936640.

The previous prime is 21011357. The next prime is 21011383. The reversal of 21011376 is 67311012.

It is a plaindrome in base 13.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3091 + ... + 7181.

Almost surely, 2^21011376 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21011376, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27400032).

21011376 is an abundant number, since it is smaller than the sum of its proper divisors (33788688).

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

21011376 is a wasteful number, since it uses less digits than its factorization.

21011376 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4209 (or 4203 counting only the distinct ones).

The product of its (nonzero) digits is 252, while the sum is 21.

The square root of 21011376 is about 4583.8167502639. The cubic root of 21011376 is about 275.9422269330.

Adding to 21011376 its reverse (67311012), we get a palindrome (88322388).

The spelling of 21011376 in words is "twenty-one million, eleven thousand, three hundred seventy-six".