21020001112 has 64 divisors (see below), whose sum is σ = 46718438400. Its totient is φ = 8759664000.

The previous prime is 21020001091. The next prime is 21020001137. The reversal of 21020001112 is 21110002012.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 150939 + ... + 254602.

It is an arithmetic number, because the mean of its divisors is an integer number (729975600).

Almost surely, 2^21020001112 is an apocalyptic number.

21020001112 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21020001112 is an abundant number, since it is smaller than the sum of its proper divisors (25698437288).

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

21020001112 is a wasteful number, since it uses less digits than its factorization.

21020001112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 405608 (or 405604 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 21020001112 its reverse (21110002012), we get a palindrome (42130003124).

The spelling of 21020001112 in words is "twenty-one billion, twenty million, one thousand, one hundred twelve".