12220021221221 has 8 divisors (see below), whose sum is σ = 13462921670688. Its totient is φ = 10999119010000.

The previous prime is 12220021221151. The next prime is 12220021221259. The reversal of 12220021221221 is 12212212002221.

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

It is not a de Polignac number, because 12220021221221 - 2⁴² = 7821974710117 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12220021221193 and 12220021221202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12220021421221) 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, 5499558395 + ... + 5499560616.

It is an arithmetic number, because the mean of its divisors is an integer number (1682865208836).

Almost surely, 2^{12220021221221} is an apocalyptic number.

12220021221221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12220021221221 is a deficient number, since it is larger than the sum of its proper divisors (1242900449467).

12220021221221 is a wasteful number, since it uses less digits than its factorization.

12220021221221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10999119123.

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 12220021221221 its reverse (12212212002221), we get a palindrome (24432233223442).

The spelling of 12220021221221 in words is "twelve trillion, two hundred twenty billion, twenty-one million, two hundred twenty-one thousand, two hundred twenty-one".