210001220102121 has 16 divisors (see below), whose sum is σ = 333914983517184. Its totient is φ = 114783275583504.

The previous prime is 210001220102083. The next prime is 210001220102153. The reversal of 210001220102121 is 121201022100012.

It is not a de Polignac number, because 210001220102121 - 2¹⁸ = 210001219839977 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 210001220102121.

It is not an unprimeable number, because it can be changed into a prime (210001220102521) 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, 217392566911 + ... + 217392567876.

It is an arithmetic number, because the mean of its divisors is an integer number (20869686469824).

Almost surely, 2^{210001220102121} is an apocalyptic number.

210001220102121 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

210001220102121 is a deficient number, since it is larger than the sum of its proper divisors (123913763415063).

210001220102121 is a wasteful number, since it uses less digits than its factorization.

210001220102121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 434785134820.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 210001220102121 its reverse (121201022100012), we get a palindrome (331202242202133).

The spelling of 210001220102121 in words is "two hundred ten trillion, one billion, two hundred twenty million, one hundred two thousand, one hundred twenty-one".