121210100021121 has 8 divisors (see below), whose sum is σ = 161614470906240. Its totient is φ = 80806231241712.

The previous prime is 121210100021119. The next prime is 121210100021239. The reversal of 121210100021121 is 121120001012121.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 121210100021121 - 2¹ = 121210100021119 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 121210100021121.

It is not an unprimeable number, because it can be changed into a prime (121210100031121) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 124962790 + ... + 125929023.

It is an arithmetic number, because the mean of its divisors is an integer number (20201808863280).

Almost surely, 2^{121210100021121} is an apocalyptic number.

It is an amenable number.

121210100021121 is a deficient number, since it is larger than the sum of its proper divisors (40404370885119).

121210100021121 is a wasteful number, since it uses less digits than its factorization.

121210100021121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 251052855.

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

Adding to 121210100021121 its reverse (121120001012121), we get a palindrome (242330101033242).

The spelling of 121210100021121 in words is "one hundred twenty-one trillion, two hundred ten billion, one hundred million, twenty-one thousand, one hundred twenty-one".