21210021112 has 16 divisors (see below), whose sum is σ = 45450045360. Its totient is φ = 9090009024.

The previous prime is 21210021103. The next prime is 21210021137. The reversal of 21210021112 is 21112001212.

It is a junction number, because it is equal to n+sod(n) for n = 21210021092 and 21210021101.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 189375133 + ... + 189375244.

It is an arithmetic number, because the mean of its divisors is an integer number (2840627835).

Almost surely, 2^21210021112 is an apocalyptic number.

It is an amenable number.

21210021112 is an abundant number, since it is smaller than the sum of its proper divisors (24240024248).

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

21210021112 is a wasteful number, since it uses less digits than its factorization.

21210021112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 378750390 (or 378750386 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 21210021112 its reverse (21112001212), we get a palindrome (42322022324).

The spelling of 21210021112 in words is "twenty-one billion, two hundred ten million, twenty-one thousand, one hundred twelve".