21213600134553 has 24 divisors (see below), whose sum is σ = 30752283071016. Its totient is φ = 14091443251200.

The previous prime is 21213600134479. The next prime is 21213600134663. The reversal of 21213600134553 is 35543100631212.

21213600134553 is a `hidden beast` number, since 2 + 1 + 2 + 1 + 3 + 600 + 1 + 3 + 45 + 5 + 3 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 2476242137664 + 18737357996889 = 1573608^2 + 4328667^2 .

It is not a de Polignac number, because 21213600134553 - 2¹⁴ = 21213600118169 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21213600132553) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 60462913 + ... + 60812753.

It is an arithmetic number, because the mean of its divisors is an integer number (1281345127959).

Almost surely, 2^{21213600134553} is an apocalyptic number.

It is an amenable number.

21213600134553 is a deficient number, since it is larger than the sum of its proper divisors (9538682936463).

21213600134553 is a wasteful number, since it uses less digits than its factorization.

21213600134553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 374105 (or 374102 counting only the distinct ones).

The product of its (nonzero) digits is 64800, while the sum is 36.

Adding to 21213600134553 its reverse (35543100631212), we get a palindrome (56756700765765).

The spelling of 21213600134553 in words is "twenty-one trillion, two hundred thirteen billion, six hundred million, one hundred thirty-four thousand, five hundred fifty-three".