21723535146117 has 16 divisors (see below), whose sum is σ = 33909908522112. Its totient is φ = 12110681614080.

The previous prime is 21723535146077. The next prime is 21723535146127. The reversal of 21723535146117 is 71164153532712.

It is a happy number.

It is not a de Polignac number, because 21723535146117 - 2⁷ = 21723535145989 is a prime.

It is a super-3 number, since 3×21723535146117³ (a number of 41 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21723535146127) 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 15 ways as a sum of consecutive naturals, for example, 12615292488 + ... + 12615294209.

It is an arithmetic number, because the mean of its divisors is an integer number (2119369282632).

Almost surely, 2^{21723535146117} is an apocalyptic number.

It is an amenable number.

21723535146117 is a deficient number, since it is larger than the sum of its proper divisors (12186373375995).

21723535146117 is a wasteful number, since it uses less digits than its factorization.

21723535146117 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25230586748.

The product of its digits is 1058400, while the sum is 48.

Adding to 21723535146117 its reverse (71164153532712), we get a palindrome (92887688678829).

The spelling of 21723535146117 in words is "twenty-one trillion, seven hundred twenty-three billion, five hundred thirty-five million, one hundred forty-six thousand, one hundred seventeen".