21012202112 has 64 divisors (see below), whose sum is σ = 45827955360. Its totient is φ = 9517071360.

The previous prime is 21012202091. The next prime is 21012202117. The reversal of 21012202112 is 21120221012.

It is a tau number, because it is divible by the number of its divisors (64).

It is a super-3 number, since 3×21012202112³ (a number of 32 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (21012202117) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 372098 + ... + 424830.

Almost surely, 2^21012202112 is an apocalyptic number.

21012202112 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 21012202112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22913977680).

21012202112 is an abundant number, since it is smaller than the sum of its proper divisors (24815753248).

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

21012202112 is a wasteful number, since it uses less digits than its factorization.

21012202112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53041 (or 53029 counting only the distinct ones).

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

Adding to 21012202112 its reverse (21120221012), we get a palindrome (42132423124).

The spelling of 21012202112 in words is "twenty-one billion, twelve million, two hundred two thousand, one hundred twelve".