21020112106 has 32 divisors (see below), whose sum is σ = 37021691520. Its totient is φ = 8761991616.

The previous prime is 21020112103. The next prime is 21020112161. The reversal of 21020112106 is 60121102012.

It is a super-2 number, since 2×21020112106² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21020112106.

It is not an unprimeable number, because it can be changed into a prime (21020112103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1931376 + ... + 1942228.

It is an arithmetic number, because the mean of its divisors is an integer number (1156927860).

Almost surely, 2^21020112106 is an apocalyptic number.

21020112106 is a deficient number, since it is larger than the sum of its proper divisors (16001579414).

21020112106 is a wasteful number, since it uses less digits than its factorization.

21020112106 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14638.

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 21020112106 its reverse (60121102012), we get a palindrome (81141214118).

The spelling of 21020112106 in words is "twenty-one billion, twenty million, one hundred twelve thousand, one hundred six".