21305040105133 has 8 divisors (see below), whose sum is σ = 21403752502968. Its totient is φ = 21206544420864.

The previous prime is 21305040105109. The next prime is 21305040105157. The reversal of 21305040105133 is 33150104050312.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21305040105109) and next prime (21305040105157).

It can be written as a sum of positive squares in 4 ways, for example, as 1229998556809 + 20075041548324 = 1109053^2 + 4480518^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21305040105133 - 2⁵ = 21305040105101 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21305040105103) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 53981316 + ... + 54374557.

It is an arithmetic number, because the mean of its divisors is an integer number (2675469062871).

Almost surely, 2^{21305040105133} is an apocalyptic number.

It is an amenable number.

21305040105133 is a deficient number, since it is larger than the sum of its proper divisors (98712397835).

21305040105133 is a wasteful number, since it uses less digits than its factorization.

21305040105133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108356783.

The product of its (nonzero) digits is 5400, while the sum is 28.

Adding to 21305040105133 its reverse (33150104050312), we get a palindrome (54455144155445).

The spelling of 21305040105133 in words is "twenty-one trillion, three hundred five billion, forty million, one hundred five thousand, one hundred thirty-three".