12121302221 has 8 divisors (see below), whose sum is σ = 13854373440. Its totient is φ = 10388595168.

The previous prime is 12121302211. The next prime is 12121302227. The reversal of 12121302221 is 12220312121.

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

It is not a de Polignac number, because 12121302221 - 2¹⁴ = 12121285837 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12121302221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12121302227) 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, 15536 + ... + 156473.

It is an arithmetic number, because the mean of its divisors is an integer number (1731796680).

Almost surely, 2^12121302221 is an apocalyptic number.

It is an amenable number.

12121302221 is a deficient number, since it is larger than the sum of its proper divisors (1733071219).

12121302221 is a wasteful number, since it uses less digits than its factorization.

12121302221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 182083.

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 12121302221 its reverse (12220312121), we get a palindrome (24341614342).

The spelling of 12121302221 in words is "twelve billion, one hundred twenty-one million, three hundred two thousand, two hundred twenty-one".