12220121122221 has 8 divisors (see below), whose sum is σ = 16366559829760. Its totient is φ = 8110214914752.

The previous prime is 12220121122189. The next prime is 12220121122277. The reversal of 12220121122221 is 12222112102221.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 12220121122221 - 2⁵ = 12220121122189 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12220121126221) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9133124236 + ... + 9133125573.

It is an arithmetic number, because the mean of its divisors is an integer number (2045819978720).

Almost surely, 2^{12220121122221} is an apocalyptic number.

It is an amenable number.

12220121122221 is a deficient number, since it is larger than the sum of its proper divisors (4146438707539).

12220121122221 is a wasteful number, since it uses less digits than its factorization.

12220121122221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18266250035.

The product of its (nonzero) digits is 256, while the sum is 21.

Adding to 12220121122221 its reverse (12222112102221), we get a palindrome (24442233224442).

The spelling of 12220121122221 in words is "twelve trillion, two hundred twenty billion, one hundred twenty-one million, one hundred twenty-two thousand, two hundred twenty-one".