210011121222121 has 4 divisors (see below), whose sum is σ = 211420591834500. Its totient is φ = 208601650609744.

The previous prime is 210011121222109. The next prime is 210011121222163. The reversal of 210011121222121 is 121222121110012.

It is a happy number.

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 17458725716496 + 192552395505625 = 4178364^2 + 13876325^2 .

It is a cyclic number.

It is not a de Polignac number, because 210011121222121 - 2²³ = 210011112833513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (210011121228121) 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, 704735305966 + ... + 704735306263.

It is an arithmetic number, because the mean of its divisors is an integer number (52855147958625).

Almost surely, 2^{210011121222121} is an apocalyptic number.

It is an amenable number.

210011121222121 is a deficient number, since it is larger than the sum of its proper divisors (1409470612379).

210011121222121 is a wasteful number, since it uses less digits than its factorization.

210011121222121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1409470612378.

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 210011121222121 its reverse (121222121110012), we get a palindrome (331233242332133).

The spelling of 210011121222121 in words is "two hundred ten trillion, eleven billion, one hundred twenty-one million, two hundred twenty-two thousand, one hundred twenty-one".