21144315453 has 8 divisors (see below), whose sum is σ = 28398205248. Its totient is φ = 13993317984.

The previous prime is 21144315427. The next prime is 21144315469. The reversal of 21144315453 is 35451344112.

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

It is not a de Polignac number, because 21144315453 - 2⁸ = 21144315197 is a prime.

It is a super-3 number, since 3×21144315453³ (a number of 32 digits) contains 333 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21144315553) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25722601 + ... + 25723422.

It is an arithmetic number, because the mean of its divisors is an integer number (3549775656).

Almost surely, 2^21144315453 is an apocalyptic number.

It is an amenable number.

21144315453 is a deficient number, since it is larger than the sum of its proper divisors (7253889795).

21144315453 is a wasteful number, since it uses less digits than its factorization.

21144315453 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51446163.

The product of its digits is 28800, while the sum is 33.

Adding to 21144315453 its reverse (35451344112), we get a palindrome (56595659565).

The spelling of 21144315453 in words is "twenty-one billion, one hundred forty-four million, three hundred fifteen thousand, four hundred fifty-three".