21935065198818 has 16 divisors (see below), whose sum is σ = 43944866572320. Its totient is φ = 7299232370496.

The previous prime is 21935065198811. The next prime is 21935065198903. The reversal of 21935065198818 is 81889156053912.

It is a super-2 number, since 2×21935065198818² (a number of 27 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21935065198811) 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, 3114003463 + ... + 3114010506.

It is an arithmetic number, because the mean of its divisors is an integer number (2746554160770).

Almost surely, 2^{21935065198818} is an apocalyptic number.

21935065198818 is an abundant number, since it is smaller than the sum of its proper divisors (22009801373502).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21935065198818 is a wasteful number, since it uses less digits than its factorization.

21935065198818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6228014561.

The product of its (nonzero) digits is 37324800, while the sum is 66.

The spelling of 21935065198818 in words is "twenty-one trillion, nine hundred thirty-five billion, sixty-five million, one hundred ninety-eight thousand, eight hundred eighteen".