21202118183 has 16 divisors (see below), whose sum is σ = 22604832000. Its totient is φ = 19828809792.

The previous prime is 21202118141. The next prime is 21202118227. The reversal of 21202118183 is 38181120212.

It is a de Polignac number, because none of the positive numbers 2^k-21202118183 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21202118683) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1084388 + ... + 1103766.

It is an arithmetic number, because the mean of its divisors is an integer number (1412802000).

Almost surely, 2^21202118183 is an apocalyptic number.

21202118183 is a deficient number, since it is larger than the sum of its proper divisors (1402713817).

21202118183 is a wasteful number, since it uses less digits than its factorization.

21202118183 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20134.

The product of its (nonzero) digits is 1536, while the sum is 29.

Adding to 21202118183 its reverse (38181120212), we get a palindrome (59383238395).

The spelling of 21202118183 in words is "twenty-one billion, two hundred two million, one hundred eighteen thousand, one hundred eighty-three".