21441396 has 24 divisors (see below), whose sum is σ = 50365504. Its totient is φ = 7099200.

The previous prime is 21441383. The next prime is 21441421. The reversal of 21441396 is 69314412.

It is a Smith number, since the sum of its digits (30) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4105 + ... + 7728.

Almost surely, 2^21441396 is an apocalyptic number.

It is an amenable number.

21441396 is an abundant number, since it is smaller than the sum of its proper divisors (28924108).

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

21441396 is a wasteful number, since it uses less digits than its factorization.

21441396 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11991 (or 11989 counting only the distinct ones).

The product of its digits is 5184, while the sum is 30.

The square root of 21441396 is about 4630.4855037026. The cubic root of 21441396 is about 277.8120116860.

Adding to 21441396 its sum of digits (30), we get a triangular number (21441426 = T₆₅₄₈).

The spelling of 21441396 in words is "twenty-one million, four hundred forty-one thousand, three hundred ninety-six".