21011210102112 has 96 divisors (see below), whose sum is σ = 55832530860288. Its totient is φ = 6917669316096.

The previous prime is 21011210101891. The next prime is 21011210102177. The reversal of 21011210102112 is 21120101211012.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (96).

It is a super-2 number, since 2×21011210102112² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21011210102091 and 21011210102100.

It is a congruent number.

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, 32612733 + ... + 33250755.

It is an arithmetic number, because the mean of its divisors is an integer number (581588863128).

Almost surely, 2^{21011210102112} 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 21011210102112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27916265430144).

21011210102112 is an abundant number, since it is smaller than the sum of its proper divisors (34821320758176).

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

21011210102112 is a wasteful number, since it uses less digits than its factorization.

21011210102112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 642252 (or 642244 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 21011210102112 its reverse (21120101211012), we get a palindrome (42131311313124).

The spelling of 21011210102112 in words is "twenty-one trillion, eleven billion, two hundred ten million, one hundred two thousand, one hundred twelve".