1200122220021 has 4 divisors (see below), whose sum is σ = 1600162960032. Its totient is φ = 800081480012.

The previous prime is 1200122220013. The next prime is 1200122220071. The reversal of 1200122220021 is 1200222210021.

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 1200122220021 - 2³ = 1200122220013 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1200122220001) 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, 200020370001 + ... + 200020370006.

It is an arithmetic number, because the mean of its divisors is an integer number (400040740008).

Almost surely, 2^{1200122220021} is an apocalyptic number.

It is an amenable number.

1200122220021 is a deficient number, since it is larger than the sum of its proper divisors (400040740011).

1200122220021 is an equidigital number, since it uses as much as digits as its factorization.

1200122220021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 400040740010.

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 1200122220021 its reverse (1200222210021), we get a palindrome (2400344430042).

The spelling of 1200122220021 in words is "one trillion, two hundred billion, one hundred twenty-two million, two hundred twenty thousand, twenty-one".