21012021100112 has 80 divisors (see below), whose sum is σ = 49039116474240. Its totient is φ = 8530579739136.

The previous prime is 21012021100099. The next prime is 21012021100121. The reversal of 21012021100112 is 21100112021012.

It is a Harshad number since it is a multiple of its sum of digits (14).

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, 60858218 + ... + 61202505.

It is an arithmetic number, because the mean of its divisors is an integer number (612988955928).

Almost surely, 2^{21012021100112} is an apocalyptic number.

It is an amenable number.

21012021100112 is an abundant number, since it is smaller than the sum of its proper divisors (28027095374128).

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

21012021100112 is a wasteful number, since it uses less digits than its factorization.

21012021100112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122060820 (or 122060814 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 21012021100112 its reverse (21100112021012), we get a palindrome (42112133121124).

The spelling of 21012021100112 in words is "twenty-one trillion, twelve billion, twenty-one million, one hundred thousand, one hundred twelve".