210000121221011 has 4 divisors (see below), whose sum is σ = 229091041332024. Its totient is φ = 190909201110000.

The previous prime is 210000121220999. The next prime is 210000121221029. The reversal of 210000121221011 is 110122121000012.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-210000121221011 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (210000121221031) 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, 9545460055490 + ... + 9545460055511.

It is an arithmetic number, because the mean of its divisors is an integer number (57272760333006).

Almost surely, 2^{210000121221011} is an apocalyptic number.

210000121221011 is a deficient number, since it is larger than the sum of its proper divisors (19090920111013).

210000121221011 is a wasteful number, since it uses less digits than its factorization.

210000121221011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19090920111012.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 210000121221011 its reverse (110122121000012), we get a palindrome (320122242221023).

The spelling of 210000121221011 in words is "two hundred ten trillion, one hundred twenty-one million, two hundred twenty-one thousand, eleven".