21540296 has 8 divisors (see below), whose sum is σ = 40388070. Its totient is φ = 10770144.

The previous prime is 21540289. The next prime is 21540307. The reversal of 21540296 is 69204512.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 20124196 + 1416100 = 4486^2 + 1190^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1346261 + ... + 1346276.

Almost surely, 2^21540296 is an apocalyptic number.

It is an amenable number.

21540296 is a deficient number, since it is larger than the sum of its proper divisors (18847774).

21540296 is a wasteful number, since it uses less digits than its factorization.

21540296 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2692543 (or 2692539 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 21540296 is about 4641.1524430900. The cubic root of 21540296 is about 278.2384993311.

The spelling of 21540296 in words is "twenty-one million, five hundred forty thousand, two hundred ninety-six".