21311054041345 has 16 divisors (see below), whose sum is σ = 26701813959552. Its totient is φ = 16297403161600.

The previous prime is 21311054041339. The next prime is 21311054041373. The reversal of 21311054041345 is 54314045011312.

It is not a de Polignac number, because 21311054041345 - 2³ = 21311054041337 is a prime.

It is a super-2 number, since 2×21311054041345² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21311054041345.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 57690187 + ... + 58058416.

It is an arithmetic number, because the mean of its divisors is an integer number (1668863372472).

Almost surely, 2^{21311054041345} is an apocalyptic number.

It is an amenable number.

21311054041345 is a deficient number, since it is larger than the sum of its proper divisors (5390759918207).

21311054041345 is a wasteful number, since it uses less digits than its factorization.

21311054041345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115750232.

The product of its (nonzero) digits is 28800, while the sum is 34.

Adding to 21311054041345 its reverse (54314045011312), we get a palindrome (75625099052657).

The spelling of 21311054041345 in words is "twenty-one trillion, three hundred eleven billion, fifty-four million, forty-one thousand, three hundred forty-five".