21178041 has 8 divisors (see below), whose sum is σ = 28700544. Its totient is φ = 13887120.

The previous prime is 21178037. The next prime is 21178049. The reversal of 21178041 is 14087112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21178041 - 2² = 21178037 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21178049) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 57681 + ... + 58046.

It is an arithmetic number, because the mean of its divisors is an integer number (3587568).

Almost surely, 2^21178041 is an apocalyptic number.

It is an amenable number.

21178041 is a deficient number, since it is larger than the sum of its proper divisors (7522503).

21178041 is a wasteful number, since it uses less digits than its factorization.

21178041 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115791.

The product of its (nonzero) digits is 448, while the sum is 24.

The square root of 21178041 is about 4601.9605604568. The cubic root of 21178041 is about 276.6699096409.

The spelling of 21178041 in words is "twenty-one million, one hundred seventy-eight thousand, forty-one".