21960785 has 16 divisors (see below), whose sum is σ = 32856192. Its totient is φ = 13689600.

The previous prime is 21960781. The next prime is 21960811. The reversal of 21960785 is 58706912.

It is not a de Polignac number, because 21960785 - 2² = 21960781 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21960781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28136 + ... + 28905.

It is an arithmetic number, because the mean of its divisors is an integer number (2053512).

Almost surely, 2^21960785 is an apocalyptic number.

It is an amenable number.

21960785 is a deficient number, since it is larger than the sum of its proper divisors (10895407).

21960785 is a wasteful number, since it uses less digits than its factorization.

21960785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57064.

The product of its (nonzero) digits is 30240, while the sum is 38.

The square root of 21960785 is about 4686.2335622544. The cubic root of 21960785 is about 280.0373462090.

The spelling of 21960785 in words is "twenty-one million, nine hundred sixty thousand, seven hundred eighty-five".