12200120021 has 4 divisors (see below), whose sum is σ = 12354552000. Its totient is φ = 12045688044.

The previous prime is 12200119969. The next prime is 12200120041. The reversal of 12200120021 is 12002100221.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 12200120021 - 2²² = 12195925717 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 12200119984 and 12200120011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12200120041) 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, 77215871 + ... + 77216028.

It is an arithmetic number, because the mean of its divisors is an integer number (3088638000).

Almost surely, 2^12200120021 is an apocalyptic number.

It is an amenable number.

12200120021 is a deficient number, since it is larger than the sum of its proper divisors (154431979).

12200120021 is an equidigital number, since it uses as much as digits as its factorization.

12200120021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154431978.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 12200120021 its reverse (12002100221), we get a palindrome (24202220242).

The spelling of 12200120021 in words is "twelve billion, two hundred million, one hundred twenty thousand, twenty-one".