21229441 has 8 divisors (see below), whose sum is σ = 22389120. Its totient is φ = 20074032.

The previous prime is 21229409. The next prime is 21229463. The reversal of 21229441 is 14492212.

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

It is not a de Polignac number, because 21229441 - 2⁵ = 21229409 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21229471) 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 7 ways as a sum of consecutive naturals, for example, 18696 + ... + 19798.

It is an arithmetic number, because the mean of its divisors is an integer number (2798640).

Almost surely, 2^21229441 is an apocalyptic number.

It is an amenable number.

21229441 is a deficient number, since it is larger than the sum of its proper divisors (1159679).

21229441 is a wasteful number, since it uses less digits than its factorization.

21229441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2135.

The product of its digits is 1152, while the sum is 25.

The square root of 21229441 is about 4607.5417523881. The cubic root of 21229441 is about 276.8935586552.

The spelling of 21229441 in words is "twenty-one million, two hundred twenty-nine thousand, four hundred forty-one".