12221121221101 has 4 divisors (see below), whose sum is σ = 13161207468892. Its totient is φ = 11281034973312.

The previous prime is 12221121221053. The next prime is 12221121221107. The reversal of 12221121221101 is 10112212112221.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3417432876900 + 8803688344201 = 1848630^2 + 2967101^2 .

It is not a de Polignac number, because 12221121221101 - 2⁹ = 12221121220589 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 (12221121221107) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 470043123876 + ... + 470043123901.

It is an arithmetic number, because the mean of its divisors is an integer number (3290301867223).

Almost surely, 2^{12221121221101} is an apocalyptic number.

It is an amenable number.

12221121221101 is a deficient number, since it is larger than the sum of its proper divisors (940086247791).

12221121221101 is an equidigital number, since it uses as much as digits as its factorization.

12221121221101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 940086247790.

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 12221121221101 its reverse (10112212112221), we get a palindrome (22333333333322).

The spelling of 12221121221101 in words is "twelve trillion, two hundred twenty-one billion, one hundred twenty-one million, two hundred twenty-one thousand, one hundred one".