21027376 has 30 divisors (see below), whose sum is σ = 43048460. Its totient is φ = 9922464.

The previous prime is 21027373. The next prime is 21027389. The reversal of 21027376 is 67372012.

It is not an unprimeable number, because it can be changed into a prime (21027373) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 79821 + ... + 80083.

Almost surely, 2^21027376 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 21027376, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21524230).

21027376 is an abundant number, since it is smaller than the sum of its proper divisors (22021084).

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

21027376 is an equidigital number, since it uses as much as digits as its factorization.

21027376 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 553 (or 284 counting only the distinct ones).

The product of its (nonzero) digits is 3528, while the sum is 28.

The square root of 21027376 is about 4585.5616886048. The cubic root of 21027376 is about 276.0122517841.

Adding to 21027376 its reverse (67372012), we get a palindrome (88399388).

The spelling of 21027376 in words is "twenty-one million, twenty-seven thousand, three hundred seventy-six".