210021202120111 has 16 divisors (see below), whose sum is σ = 211576279543200. Its totient is φ = 208472774686848.

The previous prime is 210021202120109. The next prime is 210021202120123. The reversal of 210021202120111 is 111021202120012.

It is a cyclic number.

It is not a de Polignac number, because 210021202120111 - 2¹ = 210021202120109 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210021202121111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 127377885 + ... + 129016153.

It is an arithmetic number, because the mean of its divisors is an integer number (13223517471450).

Almost surely, 2^{210021202120111} is an apocalyptic number.

210021202120111 is a deficient number, since it is larger than the sum of its proper divisors (1555077423089).

210021202120111 is a wasteful number, since it uses less digits than its factorization.

210021202120111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1640298.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 210021202120111 its reverse (111021202120012), we get a palindrome (321042404240123).

Subtracting from 210021202120111 its reverse (111021202120012), we obtain a palindrome (99000000000099).

The spelling of 210021202120111 in words is "two hundred ten trillion, twenty-one billion, two hundred two million, one hundred twenty thousand, one hundred eleven".