21101220020112 has 20 divisors (see below), whose sum is σ = 54511485052080. Its totient is φ = 7033740006688.

The previous prime is 21101220020057. The next prime is 21101220020113. The reversal of 21101220020112 is 21102002210112.

It is a super-2 number, since 2×21101220020112² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21101220020091 and 21101220020100.

It is not an unprimeable number, because it can be changed into a prime (21101220020113) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 219804375162 + ... + 219804375257.

It is an arithmetic number, because the mean of its divisors is an integer number (2725574252604).

Almost surely, 2^{21101220020112} is an apocalyptic number.

It is an amenable number.

21101220020112 is an abundant number, since it is smaller than the sum of its proper divisors (33410265031968).

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

21101220020112 is a wasteful number, since it uses less digits than its factorization.

21101220020112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 439608750430 (or 439608750424 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 21101220020112 its reverse (21102002210112), we get a palindrome (42203222230224).

The spelling of 21101220020112 in words is "twenty-one trillion, one hundred one billion, two hundred twenty million, twenty thousand, one hundred twelve".