21442201 has 8 divisors (see below), whose sum is σ = 23425344. Its totient is φ = 19464720.

The previous prime is 21442163. The next prime is 21442229. The reversal of 21442201 is 10224412.

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

It is not a de Polignac number, because 21442201 - 2⁷ = 21442073 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21442261) 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, 12540 + ... + 14146.

It is an arithmetic number, because the mean of its divisors is an integer number (2928168).

Almost surely, 2^21442201 is an apocalyptic number.

It is an amenable number.

21442201 is a deficient number, since it is larger than the sum of its proper divisors (1983143).

21442201 is a wasteful number, since it uses less digits than its factorization.

21442201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2831.

The product of its (nonzero) digits is 128, while the sum is 16.

The square root of 21442201 is about 4630.5724268172. The cubic root of 21442201 is about 277.8154883854.

Adding to 21442201 its reverse (10224412), we get a palindrome (31666613).

The spelling of 21442201 in words is "twenty-one million, four hundred forty-two thousand, two hundred one".