210121113311 has 2 divisors, whose sum is σ = 210121113312. Its totient is φ = 210121113310.

The previous prime is 210121113287. The next prime is 210121113337. The reversal of 210121113311 is 113311121012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 210121113311 - 2⁶ = 210121113247 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 210121113311.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (210121113611) 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 as a sum of consecutive naturals, namely, 105060556655 + 105060556656.

It is an arithmetic number, because the mean of its divisors is an integer number (105060556656).

Almost surely, 2^210121113311 is an apocalyptic number.

210121113311 is a deficient number, since it is larger than the sum of its proper divisors (1).

210121113311 is an equidigital number, since it uses as much as digits as its factorization.

210121113311 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36, while the sum is 17.

Adding to 210121113311 its reverse (113311121012), we get a palindrome (323432234323).

The spelling of 210121113311 in words is "two hundred ten billion, one hundred twenty-one million, one hundred thirteen thousand, three hundred eleven".