1220220122021 has 4 divisors (see below), whose sum is σ = 1221844916544. Its totient is φ = 1218595327500.

The previous prime is 1220220121987. The next prime is 1220220122081. The reversal of 1220220122021 is 1202210220221.

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 1220220122021 - 2³⁴ = 1203040252837 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220220122081) 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, 812396135 + ... + 812397636.

It is an arithmetic number, because the mean of its divisors is an integer number (305461229136).

Almost surely, 2^{1220220122021} is an apocalyptic number.

It is an amenable number.

1220220122021 is a deficient number, since it is larger than the sum of its proper divisors (1624794523).

1220220122021 is an equidigital number, since it uses as much as digits as its factorization.

1220220122021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1624794522.

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

Adding to 1220220122021 its reverse (1202210220221), we get a palindrome (2422430342242).

The spelling of 1220220122021 in words is "one trillion, two hundred twenty billion, two hundred twenty million, one hundred twenty-two thousand, twenty-one".