21344313133 has 16 divisors (see below), whose sum is σ = 25324129152. Its totient is φ = 17733960000.

The previous prime is 21344313131. The next prime is 21344313143. The reversal of 21344313133 is 33131344312.

It is a cyclic number.

It is not a de Polignac number, because 21344313133 - 2¹ = 21344313131 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21344313131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 724473 + ... + 753358.

It is an arithmetic number, because the mean of its divisors is an integer number (1582758072).

Almost surely, 2^21344313133 is an apocalyptic number.

It is an amenable number.

21344313133 is a deficient number, since it is larger than the sum of its proper divisors (3979816019).

21344313133 is a wasteful number, since it uses less digits than its factorization.

21344313133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1477956.

The product of its digits is 7776, while the sum is 28.

Adding to 21344313133 its reverse (33131344312), we get a palindrome (54475657445).

It can be divided in two parts, 213443 and 13133, that added together give a square (226576 = 476²).

The spelling of 21344313133 in words is "twenty-one billion, three hundred forty-four million, three hundred thirteen thousand, one hundred thirty-three".