21715754 has 8 divisors (see below), whose sum is σ = 32656068. Its totient is φ = 10830400.

The previous prime is 21715753. The next prime is 21715777. The reversal of 21715754 is 45751712.

It can be written as a sum of positive squares in 2 ways, for example, as 16216729 + 5499025 = 4027^2 + 2345^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 21715754.

It is not an unprimeable number, because it can be changed into a prime (21715753) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12737 + ... + 14340.

Almost surely, 2^21715754 is an apocalyptic number.

21715754 is a deficient number, since it is larger than the sum of its proper divisors (10940314).

21715754 is a wasteful number, since it uses less digits than its factorization.

21715754 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27480.

The product of its digits is 9800, while the sum is 32.

The square root of 21715754 is about 4660.0165235759. The cubic root of 21715754 is about 278.9919277564.

The spelling of 21715754 in words is "twenty-one million, seven hundred fifteen thousand, seven hundred fifty-four".