21550795 has 16 divisors (see below), whose sum is σ = 29822400. Its totient is φ = 14644224.

The previous prime is 21550787. The next prime is 21550801. The reversal of 21550795 is 59705512.

It is not a de Polignac number, because 21550795 - 2³ = 21550787 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21550795.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 1231 + ... + 6679.

It is an arithmetic number, because the mean of its divisors is an integer number (1863900).

Almost surely, 2^21550795 is an apocalyptic number.

21550795 is a deficient number, since it is larger than the sum of its proper divisors (8271605).

21550795 is a wasteful number, since it uses less digits than its factorization.

21550795 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5574.

The product of its (nonzero) digits is 15750, while the sum is 34.

The square root of 21550795 is about 4642.2833821300. The cubic root of 21550795 is about 278.2836975883.

The spelling of 21550795 in words is "twenty-one million, five hundred fifty thousand, seven hundred ninety-five".