1201122120021 has 4 divisors (see below), whose sum is σ = 1601496160032. Its totient is φ = 800748080012.

The previous prime is 1201122119999. The next prime is 1201122120041. The reversal of 1201122120021 is 1200212211021.

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 1201122120021 - 2¹⁰ = 1201122118997 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1201122120041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 200187020001 + ... + 200187020006.

It is an arithmetic number, because the mean of its divisors is an integer number (400374040008).

Almost surely, 2^{1201122120021} is an apocalyptic number.

It is an amenable number.

1201122120021 is a deficient number, since it is larger than the sum of its proper divisors (400374040011).

1201122120021 is an equidigital number, since it uses as much as digits as its factorization.

1201122120021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 400374040010.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 1201122120021 its reverse (1200212211021), we get a palindrome (2401334331042).

The spelling of 1201122120021 in words is "one trillion, two hundred one billion, one hundred twenty-two million, one hundred twenty thousand, twenty-one".