21311145454 has 8 divisors (see below), whose sum is σ = 31967638560. Its totient is φ = 10655265936.

The previous prime is 21311145433. The next prime is 21311145473. The reversal of 21311145454 is 45454111312.

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

It is a super-2 number, since 2×21311145454² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53574 + ... + 213289.

It is an arithmetic number, because the mean of its divisors is an integer number (3995954820).

Almost surely, 2^21311145454 is an apocalyptic number.

21311145454 is a deficient number, since it is larger than the sum of its proper divisors (10656493106).

21311145454 is a wasteful number, since it uses less digits than its factorization.

21311145454 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 306794.

The product of its digits is 9600, while the sum is 31.

Adding to 21311145454 its reverse (45454111312), we get a palindrome (66765256766).

The spelling of 21311145454 in words is "twenty-one billion, three hundred eleven million, one hundred forty-five thousand, four hundred fifty-four".