21073755 has 16 divisors (see below), whose sum is σ = 35493120. Its totient is φ = 10647648.

The previous prime is 21073739. The next prime is 21073799. The reversal of 21073755 is 55737012.

It is not a de Polignac number, because 21073755 - 2⁴ = 21073739 is a prime.

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, 36687 + ... + 37256.

It is an arithmetic number, because the mean of its divisors is an integer number (2218320).

Almost surely, 2^21073755 is an apocalyptic number.

21073755 is a deficient number, since it is larger than the sum of its proper divisors (14419365).

21073755 is a wasteful number, since it uses less digits than its factorization.

21073755 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73970.

The product of its (nonzero) digits is 7350, while the sum is 30.

The square root of 21073755 is about 4590.6159717406. The cubic root of 21073755 is about 276.2150314384.

The spelling of 21073755 in words is "twenty-one million, seventy-three thousand, seven hundred fifty-five".