1220020220121 has 4 divisors (see below), whose sum is σ = 1626693626832. Its totient is φ = 813346813412.

The previous prime is 1220020220119. The next prime is 1220020220123. The reversal of 1220020220121 is 1210220200221.

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 an interprime number because it is at equal distance from previous prime (1220020220119) and next prime (1220020220123).

It is a cyclic number.

It is not a de Polignac number, because 1220020220121 - 2¹ = 1220020220119 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1220020220121.

It is not an unprimeable number, because it can be changed into a prime (1220020220123) 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, 203336703351 + ... + 203336703356.

It is an arithmetic number, because the mean of its divisors is an integer number (406673406708).

Almost surely, 2^{1220020220121} is an apocalyptic number.

It is an amenable number.

1220020220121 is a deficient number, since it is larger than the sum of its proper divisors (406673406711).

1220020220121 is an equidigital number, since it uses as much as digits as its factorization.

1220020220121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 406673406710.

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

Adding to 1220020220121 its reverse (1210220200221), we get a palindrome (2430240420342).

The spelling of 1220020220121 in words is "one trillion, two hundred twenty billion, twenty million, two hundred twenty thousand, one hundred twenty-one".