121121010001221 has 8 divisors (see below), whose sum is σ = 165250370234400. Its totient is φ = 78869494884432.

The previous prime is 121121010001219. The next prime is 121121010001267. The reversal of 121121010001221 is 122100010121121.

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 121121010001221 - 2¹ = 121121010001219 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 121121010001221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121121010001021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 469461278946 + ... + 469461279203.

It is an arithmetic number, because the mean of its divisors is an integer number (20656296279300).

Almost surely, 2^{121121010001221} is an apocalyptic number.

It is an amenable number.

121121010001221 is a deficient number, since it is larger than the sum of its proper divisors (44129360233179).

121121010001221 is an equidigital number, since it uses as much as digits as its factorization.

121121010001221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 938922558195.

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

Adding to 121121010001221 its reverse (122100010121121), we get a palindrome (243221020122342).

The spelling of 121121010001221 in words is "one hundred twenty-one trillion, one hundred twenty-one billion, ten million, one thousand, two hundred twenty-one".