121100021101221 has 64 divisors (see below), whose sum is σ = 177523473484800. Its totient is φ = 73124237352960.

The previous prime is 121100021101183. The next prime is 121100021101243. The reversal of 121100021101221 is 122101120001121.

It is a happy number.

It is not a de Polignac number, because 121100021101221 - 2¹¹ = 121100021099173 is a prime.

It is a super-3 number, since 3×121100021101221³ (a number of 43 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a self number, because there is not a number n which added to its sum of digits gives 121100021101221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121100021101121) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 445679815 + ... + 445951451.

It is an arithmetic number, because the mean of its divisors is an integer number (2773804273200).

Almost surely, 2^{121100021101221} is an apocalyptic number.

It is an amenable number.

121100021101221 is a deficient number, since it is larger than the sum of its proper divisors (56423452383579).

121100021101221 is a wasteful number, since it uses less digits than its factorization.

121100021101221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 274814.

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

Adding to 121100021101221 its reverse (122101120001121), we get a palindrome (243201141102342).

The spelling of 121100021101221 in words is "one hundred twenty-one trillion, one hundred billion, twenty-one million, one hundred one thousand, two hundred twenty-one".