21473556133 has 2 divisors, whose sum is σ = 21473556134. Its totient is φ = 21473556132.

The previous prime is 21473556121. The next prime is 21473556197. The reversal of 21473556133 is 33165537412.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11985432484 + 9488123649 = 109478^2 + 97407^2 .

It is a cyclic number.

It is not a de Polignac number, because 21473556133 - 2¹³ = 21473547941 is a prime.

It is a super-2 number, since 2×21473556133² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21473556233) 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 as a sum of consecutive naturals, namely, 10736778066 + 10736778067.

It is an arithmetic number, because the mean of its divisors is an integer number (10736778067).

Almost surely, 2^21473556133 is an apocalyptic number.

It is an amenable number.

21473556133 is a deficient number, since it is larger than the sum of its proper divisors (1).

21473556133 is an equidigital number, since it uses as much as digits as its factorization.

21473556133 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 226800, while the sum is 40.

The spelling of 21473556133 in words is "twenty-one billion, four hundred seventy-three million, five hundred fifty-six thousand, one hundred thirty-three".