21396041 has 8 divisors (see below), whose sum is σ = 21695040. Its totient is φ = 21099088.

The previous prime is 21396031. The next prime is 21396043. The reversal of 21396041 is 14069312.

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

It is a cyclic number.

It is not a de Polignac number, because 21396041 - 2¹⁸ = 21133897 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21396041.

It is not an unprimeable number, because it can be changed into a prime (21396043) 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, 38135 + ... + 38691.

It is an arithmetic number, because the mean of its divisors is an integer number (2711880).

Almost surely, 2^21396041 is an apocalyptic number.

It is an amenable number.

21396041 is a deficient number, since it is larger than the sum of its proper divisors (298999).

21396041 is a wasteful number, since it uses less digits than its factorization.

21396041 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1023.

The product of its (nonzero) digits is 1296, while the sum is 26.

The square root of 21396041 is about 4625.5854764559. The cubic root of 21396041 is about 277.6159880902.

The spelling of 21396041 in words is "twenty-one million, three hundred ninety-six thousand, forty-one".