21144201 has 16 divisors (see below), whose sum is σ = 31342080. Its totient is φ = 12591360.

The previous prime is 21144187. The next prime is 21144203. The reversal of 21144201 is 10244112.

It is not a de Polignac number, because 21144201 - 2¹¹ = 21142153 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21144203) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7536 + ... + 9953.

It is an arithmetic number, because the mean of its divisors is an integer number (1958880).

Almost surely, 2^21144201 is an apocalyptic number.

It is an amenable number.

21144201 is a deficient number, since it is larger than the sum of its proper divisors (10197879).

21144201 is a wasteful number, since it uses less digits than its factorization.

21144201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17536.

The product of its (nonzero) digits is 64, while the sum is 15.

The square root of 21144201 is about 4598.2823967216. The cubic root of 21144201 is about 276.5224691717.

Adding to 21144201 its reverse (10244112), we get a palindrome (31388313).

The spelling of 21144201 in words is "twenty-one million, one hundred forty-four thousand, two hundred one".