21210203112 has 192 divisors, whose sum is σ = 65460441600. Its totient is φ = 5697901440.

The previous prime is 21210203093. The next prime is 21210203143. The reversal of 21210203112 is 21130201212.

It is a junction number, because it is equal to n+sod(n) for n = 21210203091 and 21210203100.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1589187 + ... + 1602477.

It is an arithmetic number, because the mean of its divisors is an integer number (340939800).

Almost surely, 2^21210203112 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21210203112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32730220800).

21210203112 is an abundant number, since it is smaller than the sum of its proper divisors (44250238488).

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

21210203112 is a wasteful number, since it uses less digits than its factorization.

21210203112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13396 (or 13385 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 21210203112 its reverse (21130201212), we get a palindrome (42340404324).

The spelling of 21210203112 in words is "twenty-one billion, two hundred ten million, two hundred three thousand, one hundred twelve".