21912010 has 16 divisors (see below), whose sum is σ = 40111200. Its totient is φ = 8616016.

The previous prime is 21911987. The next prime is 21912013. The reversal of 21912010 is 1021912.

It is not an unprimeable number, because it can be changed into a prime (21912013) 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, 17980 + ... + 19159.

It is an arithmetic number, because the mean of its divisors is an integer number (2506950).

Almost surely, 2^21912010 is an apocalyptic number.

21912010 is a deficient number, since it is larger than the sum of its proper divisors (18199190).

21912010 is a wasteful number, since it uses less digits than its factorization.

21912010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37205.

The product of its (nonzero) digits is 36, while the sum is 16.

The square root of 21912010 is about 4681.0265968054. The cubic root of 21912010 is about 279.8298711399.

Adding to 21912010 its reverse (1021912), we get a palindrome (22933922).

The spelling of 21912010 in words is "twenty-one million, nine hundred twelve thousand, ten".