12221121021 has 8 divisors (see below), whose sum is σ = 16295339040. Its totient is φ = 8147158512.

The previous prime is 12221121019. The next prime is 12221121037. The reversal of 12221121021 is 12012112221.

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

It is not a de Polignac number, because 12221121021 - 2¹ = 12221121019 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12221121061) 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, 150811 + ... + 217223.

It is an arithmetic number, because the mean of its divisors is an integer number (2036917380).

Almost surely, 2^12221121021 is an apocalyptic number.

It is an amenable number.

12221121021 is a deficient number, since it is larger than the sum of its proper divisors (4074218019).

12221121021 is an equidigital number, since it uses as much as digits as its factorization.

12221121021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127755.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 12221121021 its reverse (12012112221), we get a palindrome (24233233242).

The spelling of 12221121021 in words is "twelve billion, two hundred twenty-one million, one hundred twenty-one thousand, twenty-one".