21540968 has 16 divisors (see below), whose sum is σ = 41782500. Its totient is φ = 10398976.

The previous prime is 21540947. The next prime is 21540983. The reversal of 21540968 is 86904512.

It can be written as a sum of positive squares in 2 ways, for example, as 21362884 + 178084 = 4622^2 + 422^2 .

It is a super-3 number, since 3×21540968³ (a number of 23 digits) contains 333 as substring.

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, 46193 + ... + 46656.

Almost surely, 2^21540968 is an apocalyptic number.

It is an amenable number.

21540968 is a deficient number, since it is larger than the sum of its proper divisors (20241532).

21540968 is a wasteful number, since it uses less digits than its factorization.

21540968 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92884 (or 92880 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 35.

The square root of 21540968 is about 4641.2248383374. The cubic root of 21540968 is about 278.2413927349.

The spelling of 21540968 in words is "twenty-one million, five hundred forty thousand, nine hundred sixty-eight".