12101022221 has 4 divisors (see below), whose sum is σ = 12163722012. Its totient is φ = 12038322432.

The previous prime is 12101022217. The next prime is 12101022251. The reversal of 12101022221 is 12222010121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12222010121 = 31 ⋅394258391.

It can be written as a sum of positive squares in 2 ways, for example, as 4407100996 + 7693921225 = 66386^2 + 87715^2 .

It is a cyclic number.

It is not a de Polignac number, because 12101022221 - 2² = 12101022217 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12101022196 and 12101022205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12101022251) 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, 31349606 + ... + 31349991.

It is an arithmetic number, because the mean of its divisors is an integer number (3040930503).

Almost surely, 2^12101022221 is an apocalyptic number.

It is an amenable number.

12101022221 is a deficient number, since it is larger than the sum of its proper divisors (62699791).

12101022221 is an equidigital number, since it uses as much as digits as its factorization.

12101022221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62699790.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 12101022221 its reverse (12222010121), we get a palindrome (24323032342).

The spelling of 12101022221 in words is "twelve billion, one hundred one million, twenty-two thousand, two hundred twenty-one".