21340576 has 24 divisors (see below), whose sum is σ = 44486820. Its totient is φ = 10042368.

The previous prime is 21340567. The next prime is 21340597. The reversal of 21340576 is 67504312.

It can be written as a sum of positive squares in 2 ways, for example, as 16160400 + 5180176 = 4020^2 + 2276^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19071 + ... + 20158.

Almost surely, 2^21340576 is an apocalyptic number.

It is an amenable number.

21340576 is an abundant number, since it is smaller than the sum of its proper divisors (23146244).

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

21340576 is a wasteful number, since it uses less digits than its factorization.

21340576 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39256 (or 39248 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 28.

The square root of 21340576 is about 4619.5861286483. The cubic root of 21340576 is about 277.3758923427.

Adding to 21340576 its reverse (67504312), we get a palindrome (88844888).

The spelling of 21340576 in words is "twenty-one million, three hundred forty thousand, five hundred seventy-six".