121021102100221 has 16 divisors (see below), whose sum is σ = 122294660716800. Its totient is φ = 119750605789248.

The previous prime is 121021102100149. The next prime is 121021102100287. The reversal of 121021102100221 is 122001201120121.

It is a cyclic number.

It is not a de Polignac number, because 121021102100221 - 2²⁵ = 121021068545789 is a prime.

It is a super-2 number, since 2×121021102100221² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121021102100195 and 121021102100204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121021102160221) 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, 280995775 + ... + 281426131.

It is an arithmetic number, because the mean of its divisors is an integer number (7643416294800).

Almost surely, 2^{121021102100221} is an apocalyptic number.

It is an amenable number.

121021102100221 is a deficient number, since it is larger than the sum of its proper divisors (1273558616579).

121021102100221 is a wasteful number, since it uses less digits than its factorization.

121021102100221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 433908.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 121021102100221 its reverse (122001201120121), we get a palindrome (243022303220342).

The spelling of 121021102100221 in words is "one hundred twenty-one trillion, twenty-one billion, one hundred two million, one hundred thousand, two hundred twenty-one".