1220120222021 has 4 divisors (see below), whose sum is σ = 1228200488544. Its totient is φ = 1212039955500.

The previous prime is 1220120221973. The next prime is 1220120222063. The reversal of 1220120222021 is 1202220210221.

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 1220120222021 - 2³⁴ = 1202940352837 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220120228021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4040133035 + ... + 4040133336.

It is an arithmetic number, because the mean of its divisors is an integer number (307050122136).

Almost surely, 2^{1220120222021} is an apocalyptic number.

It is an amenable number.

1220120222021 is a deficient number, since it is larger than the sum of its proper divisors (8080266523).

1220120222021 is an equidigital number, since it uses as much as digits as its factorization.

1220120222021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8080266522.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 1220120222021 its reverse (1202220210221), we get a palindrome (2422340432242).

The spelling of 1220120222021 in words is "one trillion, two hundred twenty billion, one hundred twenty million, two hundred twenty-two thousand, twenty-one".