121220220202221 has 32 divisors (see below), whose sum is σ = 185461050636288. Its totient is φ = 68989526136000.

The previous prime is 121220220202219. The next prime is 121220220202241. The reversal of 121220220202221 is 122202022022121.

It is not a de Polignac number, because 121220220202221 - 2¹ = 121220220202219 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121220220202241) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 115508160 + ... + 116552886.

It is an arithmetic number, because the mean of its divisors is an integer number (5795657832384).

Almost surely, 2^{121220220202221} is an apocalyptic number.

It is an amenable number.

121220220202221 is a deficient number, since it is larger than the sum of its proper divisors (64240830434067).

121220220202221 is a wasteful number, since it uses less digits than its factorization.

121220220202221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1067001.

The product of its (nonzero) digits is 512, while the sum is 21.

Adding to 121220220202221 its reverse (122202022022121), we get a palindrome (243422242224342).

The spelling of 121220220202221 in words is "one hundred twenty-one trillion, two hundred twenty billion, two hundred twenty million, two hundred two thousand, two hundred twenty-one".