21203211112 has 64 divisors (see below), whose sum is σ = 43081113600. Its totient is φ = 9754345920.

The previous prime is 21203211109. The next prime is 21203211149. The reversal of 21203211112 is 21111230212.

It is a super-2 number, since 2×21203211112² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 941439 + ... + 963697.

It is an arithmetic number, because the mean of its divisors is an integer number (673142400).

Almost surely, 2^21203211112 is an apocalyptic number.

It is an amenable number.

21203211112 is an abundant number, since it is smaller than the sum of its proper divisors (21877902488).

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

21203211112 is a wasteful number, since it uses less digits than its factorization.

21203211112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22486 (or 22482 counting only the distinct ones).

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

Adding to 21203211112 its reverse (21111230212), we get a palindrome (42314441324).

The spelling of 21203211112 in words is "twenty-one billion, two hundred three million, two hundred eleven thousand, one hundred twelve".