21229841 has 8 divisors (see below), whose sum is σ = 21869568. Its totient is φ = 20596000.

The previous prime is 21229837. The next prime is 21229847. The reversal of 21229841 is 14892212.

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 21229841 - 2² = 21229837 is a prime.

It is a super-2 number, since 2×21229841² = 901412297770562, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21229847) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6476 + ... + 9186.

It is an arithmetic number, because the mean of its divisors is an integer number (2733696).

Almost surely, 2^21229841 is an apocalyptic number.

It is an amenable number.

21229841 is a deficient number, since it is larger than the sum of its proper divisors (639727).

21229841 is a wasteful number, since it uses less digits than its factorization.

21229841 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2943.

The product of its digits is 2304, while the sum is 29.

The square root of 21229841 is about 4607.5851592781. The cubic root of 21229841 is about 276.8952976982.

The spelling of 21229841 in words is "twenty-one million, two hundred twenty-nine thousand, eight hundred forty-one".