12221120021 has 16 divisors (see below), whose sum is σ = 14315211648. Its totient is φ = 10309286400.

The previous prime is 12221120011. The next prime is 12221120027. The reversal of 12221120021 is 12002112221.

It is a cyclic number.

It is not a de Polignac number, because 12221120021 - 2¹⁴ = 12221103637 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12221119978 and 12221120005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12221120027) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 446960 + ... + 473513.

It is an arithmetic number, because the mean of its divisors is an integer number (894700728).

Almost surely, 2^12221120021 is an apocalyptic number.

12221120021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12221120021 is a deficient number, since it is larger than the sum of its proper divisors (2094091627).

12221120021 is a wasteful number, since it uses less digits than its factorization.

12221120021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 920572.

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

Adding to 12221120021 its reverse (12002112221), we get a palindrome (24223232242).

It can be divided in two parts, 12221 and 120021, that multiplied together give a palindrome (1466776641).

The spelling of 12221120021 in words is "twelve billion, two hundred twenty-one million, one hundred twenty thousand, twenty-one".