21169412 has 12 divisors (see below), whose sum is σ = 40414416. Its totient is φ = 9622440.

The previous prime is 21169397. The next prime is 21169417. The reversal of 21169412 is 21496112.

It is not an unprimeable number, because it can be changed into a prime (21169417) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 240518 + ... + 240605.

It is an arithmetic number, because the mean of its divisors is an integer number (3367868).

Almost surely, 2^21169412 is an apocalyptic number.

21169412 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21169412 is a deficient number, since it is larger than the sum of its proper divisors (19245004).

21169412 is a wasteful number, since it uses less digits than its factorization.

21169412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 481138 (or 481136 counting only the distinct ones).

The product of its digits is 864, while the sum is 26.

The square root of 21169412 is about 4601.0229297407. The cubic root of 21169412 is about 276.6323281200.

The spelling of 21169412 in words is "twenty-one million, one hundred sixty-nine thousand, four hundred twelve".