210121223113 has 4 divisors (see below), whose sum is σ = 210125229700. Its totient is φ = 210117216528.

The previous prime is 210121223111. The next prime is 210121223173. The reversal of 210121223113 is 311322121012.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 148539326464 + 61581896649 = 385408^2 + 248157^2 .

It is a cyclic number.

It is not a de Polignac number, because 210121223113 - 2¹ = 210121223111 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (210121223111) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1923570 + ... + 2029867.

It is an arithmetic number, because the mean of its divisors is an integer number (52531307425).

Almost surely, 2^210121223113 is an apocalyptic number.

It is an amenable number.

210121223113 is a deficient number, since it is larger than the sum of its proper divisors (4006587).

210121223113 is an equidigital number, since it uses as much as digits as its factorization.

210121223113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4006586.

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 210121223113 its reverse (311322121012), we get a palindrome (521443344125).

The spelling of 210121223113 in words is "two hundred ten billion, one hundred twenty-one million, two hundred twenty-three thousand, one hundred thirteen".