212121201111102 has 48 divisors (see below), whose sum is σ = 480627773776800. Its totient is φ = 67484853570816.

The previous prime is 212121201111059. The next prime is 212121201111107. The reversal of 212121201111102 is 201111102121212.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212121201111107) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 560390727 + ... + 560769122.

It is an arithmetic number, because the mean of its divisors is an integer number (10013078620350).

Almost surely, 2^{212121201111102} is an apocalyptic number.

212121201111102 is an abundant number, since it is smaller than the sum of its proper divisors (268506572665698).

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

212121201111102 is a wasteful number, since it uses less digits than its factorization.

212121201111102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1121160337 (or 1121160334 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 18.

Adding to 212121201111102 its reverse (201111102121212), we get a palindrome (413232303232314).

The spelling of 212121201111102 in words is "two hundred twelve trillion, one hundred twenty-one billion, two hundred one million, one hundred eleven thousand, one hundred two".