210201220120121 has 4 divisors (see below), whose sum is σ = 210211674271632. Its totient is φ = 210190765968612.

The previous prime is 210201220120117. The next prime is 210201220120127. The reversal of 210201220120121 is 121021022102012.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 210201220120121 - 2² = 210201220120117 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 210201220120121.

It is not an unprimeable number, because it can be changed into a prime (210201220120127) 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, 5227045595 + ... + 5227085808.

It is an arithmetic number, because the mean of its divisors is an integer number (52552918567908).

Almost surely, 2^{210201220120121} is an apocalyptic number.

It is an amenable number.

210201220120121 is a deficient number, since it is larger than the sum of its proper divisors (10454151511).

210201220120121 is a wasteful number, since it uses less digits than its factorization.

210201220120121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10454151510.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 210201220120121 its reverse (121021022102012), we get a palindrome (331222242222133).

The spelling of 210201220120121 in words is "two hundred ten trillion, two hundred one billion, two hundred twenty million, one hundred twenty thousand, one hundred twenty-one".