121455016003221 has 4 divisors (see below), whose sum is σ = 161940021337632. Its totient is φ = 80970010668812.

The previous prime is 121455016003187. The next prime is 121455016003283. The reversal of 121455016003221 is 122300610554121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 121455016003221 - 2¹¹ = 121455016001173 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121455016003621) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20242502667201 + ... + 20242502667206.

It is an arithmetic number, because the mean of its divisors is an integer number (40485005334408).

Almost surely, 2^{121455016003221} is an apocalyptic number.

It is an amenable number.

121455016003221 is a deficient number, since it is larger than the sum of its proper divisors (40485005334411).

121455016003221 is an equidigital number, since it uses as much as digits as its factorization.

121455016003221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40485005334410.

The product of its (nonzero) digits is 14400, while the sum is 33.

Adding to 121455016003221 its reverse (122300610554121), we get a palindrome (243755626557342).

The spelling of 121455016003221 in words is "one hundred twenty-one trillion, four hundred fifty-five billion, sixteen million, three thousand, two hundred twenty-one".