210120101120121 has 16 divisors (see below), whose sum is σ = 283219796713344. Its totient is φ = 138555327423744.

The previous prime is 210120101120119. The next prime is 210120101120129. The reversal of 210120101120121 is 121021101021012.

It is a happy number.

It is not a de Polignac number, because 210120101120121 - 2¹ = 210120101120119 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 210120101120121.

It is not an unprimeable number, because it can be changed into a prime (210120101120129) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 636203806 + ... + 636533991.

It is an arithmetic number, because the mean of its divisors is an integer number (17701237294584).

Almost surely, 2^{210120101120121} is an apocalyptic number.

It is an amenable number.

210120101120121 is a deficient number, since it is larger than the sum of its proper divisors (73099695593223).

210120101120121 is a wasteful number, since it uses less digits than its factorization.

210120101120121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1272738400.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 210120101120121 its reverse (121021101021012), we get a palindrome (331141202141133).

The spelling of 210120101120121 in words is "two hundred ten trillion, one hundred twenty billion, one hundred one million, one hundred twenty thousand, one hundred twenty-one".