1200120221221 has 4 divisors (see below), whose sum is σ = 1208174719500. Its totient is φ = 1192065722944.

The previous prime is 1200120221191. The next prime is 1200120221239. The reversal of 1200120221221 is 1221220210021.

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 582817730625 + 617302490596 = 763425^2 + 785686^2 .

It is a cyclic number.

It is not a de Polignac number, because 1200120221221 - 2⁵ = 1200120221189 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1200120221195 and 1200120221204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1200120221281) 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, 4027248916 + ... + 4027249213.

It is an arithmetic number, because the mean of its divisors is an integer number (302043679875).

Almost surely, 2^{1200120221221} is an apocalyptic number.

It is an amenable number.

1200120221221 is a deficient number, since it is larger than the sum of its proper divisors (8054498279).

1200120221221 is an equidigital number, since it uses as much as digits as its factorization.

1200120221221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8054498278.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 1200120221221 its reverse (1221220210021), we get a palindrome (2421340431242).

The spelling of 1200120221221 in words is "one trillion, two hundred billion, one hundred twenty million, two hundred twenty-one thousand, two hundred twenty-one".