21440996 has 12 divisors (see below), whose sum is σ = 37669548. Its totient is φ = 10678272.

The previous prime is 21440989. The next prime is 21440999. The reversal of 21440996 is 69904412.

It can be written as a sum of positive squares in 2 ways, for example, as 21031396 + 409600 = 4586^2 + 640^2 .

It is a zygodrome in base 3.

It is not an unprimeable number, because it can be changed into a prime (21440999) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9401 + ... + 11456.

It is an arithmetic number, because the mean of its divisors is an integer number (3139129).

Almost surely, 2^21440996 is an apocalyptic number.

It is an amenable number.

21440996 is a deficient number, since it is larger than the sum of its proper divisors (16228552).

21440996 is a wasteful number, since it uses less digits than its factorization.

21440996 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21118 (or 21116 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 35.

The square root of 21440996 is about 4630.4423114860. The cubic root of 21440996 is about 277.8102841011.

The spelling of 21440996 in words is "twenty-one million, four hundred forty thousand, nine hundred ninety-six".