21264216131353 has 4 divisors (see below), whose sum is σ = 22899925064548. Its totient is φ = 19628507198160.

The previous prime is 21264216131351. The next prime is 21264216131377. The reversal of 21264216131353 is 35313161246212.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2861943625984 + 18402272505369 = 1691728^2 + 4289787^2 .

It is a cyclic number.

It is not a de Polignac number, because 21264216131353 - 2¹ = 21264216131351 is a prime.

It is a super-2 number, since 2×21264216131353² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21264216131351) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 817854466578 + ... + 817854466603.

It is an arithmetic number, because the mean of its divisors is an integer number (5724981266137).

Almost surely, 2^{21264216131353} is an apocalyptic number.

It is an amenable number.

21264216131353 is a deficient number, since it is larger than the sum of its proper divisors (1635708933195).

21264216131353 is a wasteful number, since it uses less digits than its factorization.

21264216131353 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1635708933194.

The product of its digits is 155520, while the sum is 40.

Adding to 21264216131353 its reverse (35313161246212), we get a palindrome (56577377377565).

The spelling of 21264216131353 in words is "twenty-one trillion, two hundred sixty-four billion, two hundred sixteen million, one hundred thirty-one thousand, three hundred fifty-three".