21882945 has 16 divisors (see below), whose sum is σ = 40014720. Its totient is φ = 10003584.

The previous prime is 21882941. The next prime is 21882967. The reversal of 21882945 is 54928812.

It is not a de Polignac number, because 21882945 - 2² = 21882941 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21882941) 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, 104100 + ... + 104309.

It is an arithmetic number, because the mean of its divisors is an integer number (2500920).

Almost surely, 2^21882945 is an apocalyptic number.

It is an amenable number.

21882945 is a deficient number, since it is larger than the sum of its proper divisors (18131775).

21882945 is a wasteful number, since it uses less digits than its factorization.

21882945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 208424.

The product of its digits is 46080, while the sum is 39.

The square root of 21882945 is about 4677.9210125867. The cubic root of 21882945 is about 279.7060904073.

The spelling of 21882945 in words is "twenty-one million, eight hundred eighty-two thousand, nine hundred forty-five".