21144201333 has 16 divisors (see below), whose sum is σ = 29874974976. Its totient is φ = 13256133120.

The previous prime is 21144201317. The next prime is 21144201347. The reversal of 21144201333 is 33310244112.

It is a happy number.

It is not a de Polignac number, because 21144201333 - 2⁴ = 21144201317 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21144201313) 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, 105616 + ... + 231177.

It is an arithmetic number, because the mean of its divisors is an integer number (1867185936).

Almost surely, 2^21144201333 is an apocalyptic number.

It is an amenable number.

21144201333 is a deficient number, since it is larger than the sum of its proper divisors (8730773643).

21144201333 is a wasteful number, since it uses less digits than its factorization.

21144201333 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 338044.

The product of its (nonzero) digits is 1728, while the sum is 24.

Adding to 21144201333 its reverse (33310244112), we get a palindrome (54454445445).

The spelling of 21144201333 in words is "twenty-one billion, one hundred forty-four million, two hundred one thousand, three hundred thirty-three".