210111102120021 has 16 divisors (see below), whose sum is σ = 283531911558336. Its totient is φ = 138382281531776.

The previous prime is 210111102120013. The next prime is 210111102120037. The reversal of 210111102120021 is 120021201111012.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 210111102120021 - 2³ = 210111102120013 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210111102120001) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4307280 + ... + 20946953.

It is an arithmetic number, because the mean of its divisors is an integer number (17720744472396).

Almost surely, 2^{210111102120021} is an apocalyptic number.

It is an amenable number.

210111102120021 is a deficient number, since it is larger than the sum of its proper divisors (73420809438315).

210111102120021 is a wasteful number, since it uses less digits than its factorization.

210111102120021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25287732.

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

Adding to 210111102120021 its reverse (120021201111012), we get a palindrome (330132303231033).

The spelling of 210111102120021 in words is "two hundred ten trillion, one hundred eleven billion, one hundred two million, one hundred twenty thousand, twenty-one".