12121001221 has 8 divisors (see below), whose sum is σ = 14147308800. Its totient is φ = 10168377648.

The previous prime is 12121001203. The next prime is 12121001267. The reversal of 12121001221 is 12210012121.

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

It is a cyclic number.

It is not a de Polignac number, because 12121001221 - 2¹¹ = 12120999173 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 (12121001821) 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, 18420646 + ... + 18421303.

It is an arithmetic number, because the mean of its divisors is an integer number (1768413600).

Almost surely, 2^12121001221 is an apocalyptic number.

It is an amenable number.

12121001221 is a deficient number, since it is larger than the sum of its proper divisors (2026307579).

12121001221 is an equidigital number, since it uses as much as digits as its factorization.

12121001221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36842003.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 12121001221 its reverse (12210012121), we get a palindrome (24331013342).

The spelling of 12121001221 in words is "twelve billion, one hundred twenty-one million, one thousand, two hundred twenty-one".