21504682 has 8 divisors (see below), whose sum is σ = 32350500. Its totient is φ = 10721184.

The previous prime is 21504647. The next prime is 21504727. The reversal of 21504682 is 28640512.

It can be written as a sum of positive squares in 2 ways, for example, as 19456921 + 2047761 = 4411^2 + 1431^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×21504682² = 924902695842248, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21504682.

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, 14707 + ... + 16102.

Almost surely, 2^21504682 is an apocalyptic number.

21504682 is a deficient number, since it is larger than the sum of its proper divisors (10845818).

21504682 is a wasteful number, since it uses less digits than its factorization.

21504682 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31160.

The product of its (nonzero) digits is 3840, while the sum is 28.

The square root of 21504682 is about 4637.3140933088. The cubic root of 21504682 is about 278.0850713542.

The spelling of 21504682 in words is "twenty-one million, five hundred four thousand, six hundred eighty-two".