12221221001221 has 64 divisors (see below), whose sum is σ = 13815401472000. Its totient is φ = 10742702091264.

The previous prime is 12221221001173. The next prime is 12221221001299. The reversal of 12221221001221 is 12210012212221.

It is a cyclic number.

It is not a de Polignac number, because 12221221001221 - 2³⁵ = 12186861262853 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12221221301221) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 8218708740 + ... + 8218710226.

It is an arithmetic number, because the mean of its divisors is an integer number (215865648000).

Almost surely, 2^{12221221001221} is an apocalyptic number.

It is an amenable number.

12221221001221 is a deficient number, since it is larger than the sum of its proper divisors (1594180470779).

12221221001221 is a wasteful number, since it uses less digits than its factorization.

12221221001221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2626.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 12221221001221 its reverse (12210012212221), we get a palindrome (24431233213442).

The spelling of 12221221001221 in words is "twelve trillion, two hundred twenty-one billion, two hundred twenty-one million, one thousand, two hundred twenty-one".