10121111020221 has 16 divisors (see below), whose sum is σ = 14086918604160. Its totient is φ = 6451579259840.

The previous prime is 10121111020201. The next prime is 10121111020231. The reversal of 10121111020221 is 12202011112101.

It is a happy number.

It is not a de Polignac number, because 10121111020221 - 2⁶ = 10121111020157 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 10121111020221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10121111020201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27801366 + ... + 28163063.

It is an arithmetic number, because the mean of its divisors is an integer number (880432412760).

Almost surely, 2^{10121111020221} is an apocalyptic number.

It is an amenable number.

10121111020221 is a deficient number, since it is larger than the sum of its proper divisors (3965807583939).

10121111020221 is a wasteful number, since it uses less digits than its factorization.

10121111020221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55967076.

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

Adding to 10121111020221 its reverse (12202011112101), we get a palindrome (22323122132322).

The spelling of 10121111020221 in words is "ten trillion, one hundred twenty-one billion, one hundred eleven million, twenty thousand, two hundred twenty-one".