12020020221 has 32 divisors (see below), whose sum is σ = 18533311488. Its totient is φ = 6848490240.

The previous prime is 12020020219. The next prime is 12020020241. The reversal of 12020020221 is 12202002021.

It is not a de Polignac number, because 12020020221 - 2¹ = 12020020219 is a prime.

It is a super-2 number, since 2×12020020221² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 12020020197 and 12020020206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12020020211) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 497016 + ... + 520638.

It is an arithmetic number, because the mean of its divisors is an integer number (579165984).

Almost surely, 2^12020020221 is an apocalyptic number.

12020020221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12020020221 is a deficient number, since it is larger than the sum of its proper divisors (6513291267).

12020020221 is a wasteful number, since it uses less digits than its factorization.

12020020221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24561.

The product of its (nonzero) digits is 32, while the sum is 12.

Adding to 12020020221 its reverse (12202002021), we get a palindrome (24222022242).

The spelling of 12020020221 in words is "twelve billion, twenty million, twenty thousand, two hundred twenty-one".