21210202112 has 144 divisors (see below), whose sum is σ = 47412231552. Its totient is φ = 9405726720.

The previous prime is 21210202063. The next prime is 21210202141. The reversal of 21210202112 is 21120201212.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 67764068 + ... + 67764380.

It is an arithmetic number, because the mean of its divisors is an integer number (329251608).

Almost surely, 2^21210202112 is an apocalyptic number.

21210202112 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21210202112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23706115776).

21210202112 is an abundant number, since it is smaller than the sum of its proper divisors (26202029440).

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

21210202112 is an frugal number, since it uses more digits than its factorization.

21210202112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 405 (or 373 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21210202112 its reverse (21120201212), we get a palindrome (42330403324).

It can be divided in two parts, 21210 and 202112, that added together give a palindrome (223322).

The spelling of 21210202112 in words is "twenty-one billion, two hundred ten million, two hundred two thousand, one hundred twelve".