21968150 has 24 divisors (see below), whose sum is σ = 42181824. Its totient is φ = 8503200.

The previous prime is 21968143. The next prime is 21968153. The reversal of 21968150 is 5186912.

It is a super-2 number, since 2×21968150² = 965199228845000, which contains 22 as substring.

It is a Smith number, since the sum of its digits (32) coincides with the sum of the digits of its prime factors.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21968153) 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 11 ways as a sum of consecutive naturals, for example, 5537 + ... + 8636.

It is an arithmetic number, because the mean of its divisors is an integer number (1757576).

Almost surely, 2^21968150 is an apocalyptic number.

21968150 is a deficient number, since it is larger than the sum of its proper divisors (20213674).

21968150 is a wasteful number, since it uses less digits than its factorization.

21968150 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14216 (or 14211 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 32.

The square root of 21968150 is about 4687.0193086865. The cubic root of 21968150 is about 280.0686481340.

The spelling of 21968150 in words is "twenty-one million, nine hundred sixty-eight thousand, one hundred fifty".