1220121201023 has 4 divisors (see below), whose sum is σ = 1284338106360. Its totient is φ = 1155904295688.

The previous prime is 1220121201017. The next prime is 1220121201059. The reversal of 1220121201023 is 3201021210221.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1220121201023 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1220121200992 and 1220121201010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220121201073) 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, 32108452640 + ... + 32108452677.

It is an arithmetic number, because the mean of its divisors is an integer number (321084526590).

Almost surely, 2^{1220121201023} is an apocalyptic number.

1220121201023 is a deficient number, since it is larger than the sum of its proper divisors (64216905337).

1220121201023 is an equidigital number, since it uses as much as digits as its factorization.

1220121201023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64216905336.

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 1220121201023 its reverse (3201021210221), we get a palindrome (4421142411244).

The spelling of 1220121201023 in words is "one trillion, two hundred twenty billion, one hundred twenty-one million, two hundred one thousand, twenty-three".