21020121201112 has 32 divisors (see below), whose sum is σ = 42995933196480. Its totient is φ = 9554549270560.

The previous prime is 21020121201097. The next prime is 21020121201127. The reversal of 21020121201112 is 21110212102012.

It is an interprime number because it is at equal distance from previous prime (21020121201097) and next prime (21020121201127).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19385103 + ... + 20440705.

It is an arithmetic number, because the mean of its divisors is an integer number (1343622912390).

Almost surely, 2^{21020121201112} is an apocalyptic number.

21020121201112 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21020121201112 is an abundant number, since it is smaller than the sum of its proper divisors (21975811995368).

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

21020121201112 is a wasteful number, since it uses less digits than its factorization.

21020121201112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1281903 (or 1281899 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 21020121201112 its reverse (21110212102012), we get a palindrome (42130333303124).

The spelling of 21020121201112 in words is "twenty-one trillion, twenty billion, one hundred twenty-one million, two hundred one thousand, one hundred twelve".