210121110012 has 24 divisors (see below), whose sum is σ = 534853734912. Its totient is φ = 63673063600.

The previous prime is 210121110011. The next prime is 210121110019. The reversal of 210121110012 is 210011121012.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a self number, because there is not a number n which added to its sum of digits gives 210121110012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210121110011) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 795913164 + ... + 795913427.

It is an arithmetic number, because the mean of its divisors is an integer number (22285572288).

Almost surely, 2^210121110012 is an apocalyptic number.

210121110012 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

210121110012 is an abundant number, since it is smaller than the sum of its proper divisors (324732624900).

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

210121110012 is a wasteful number, since it uses less digits than its factorization.

210121110012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1591826609 (or 1591826607 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 210121110012 its reverse (210011121012), we get a palindrome (420132231024).

The spelling of 210121110012 in words is "two hundred ten billion, one hundred twenty-one million, one hundred ten thousand, twelve".