21968770 has 16 divisors (see below), whose sum is σ = 40819968. Its totient is φ = 8503920.

The previous prime is 21968761. The next prime is 21968773. The reversal of 21968770 is 7786912.

It is not an unprimeable number, because it can be changed into a prime (21968773) 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 7 ways as a sum of consecutive naturals, for example, 35124 + ... + 35743.

It is an arithmetic number, because the mean of its divisors is an integer number (2551248).

Almost surely, 2^21968770 is an apocalyptic number.

21968770 is a deficient number, since it is larger than the sum of its proper divisors (18851198).

21968770 is a wasteful number, since it uses less digits than its factorization.

21968770 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70905.

The product of its (nonzero) digits is 42336, while the sum is 40.

The square root of 21968770 is about 4687.0854483357. The cubic root of 21968770 is about 280.0712828716.

The spelling of 21968770 in words is "twenty-one million, nine hundred sixty-eight thousand, seven hundred seventy".