21113635165634 has 16 divisors (see below), whose sum is σ = 36367984018080. Its totient is φ = 9091996004160.

The previous prime is 21113635165607. The next prime is 21113635165663. The reversal of 21113635165634 is 43656153631112.

It is a super-2 number, since 2×21113635165634² (a number of 27 digits) contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25255544039 + ... + 25255544874.

It is an arithmetic number, because the mean of its divisors is an integer number (2272999001130).

Almost surely, 2^{21113635165634} is an apocalyptic number.

21113635165634 is a deficient number, since it is larger than the sum of its proper divisors (15254348852446).

21113635165634 is a wasteful number, since it uses less digits than its factorization.

21113635165634 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50511088945.

The product of its digits is 1166400, while the sum is 47.

Adding to 21113635165634 its reverse (43656153631112), we get a palindrome (64769788796746).

The spelling of 21113635165634 in words is "twenty-one trillion, one hundred thirteen billion, six hundred thirty-five million, one hundred sixty-five thousand, six hundred thirty-four".