1223030120021 has 4 divisors (see below), whose sum is σ = 1225867777344. Its totient is φ = 1220192462700.

The previous prime is 1223030120017. The next prime is 1223030120041. The reversal of 1223030120021 is 1200210303221.

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 1223030120021 - 2² = 1223030120017 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 (1223030120041) 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, 1418828015 + ... + 1418828876.

It is an arithmetic number, because the mean of its divisors is an integer number (306466944336).

Almost surely, 2^{1223030120021} is an apocalyptic number.

It is an amenable number.

1223030120021 is a deficient number, since it is larger than the sum of its proper divisors (2837657323).

1223030120021 is an equidigital number, since it uses as much as digits as its factorization.

1223030120021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2837657322.

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 1223030120021 its reverse (1200210303221), we get a palindrome (2423240423242).

The spelling of 1223030120021 in words is "one trillion, two hundred twenty-three billion, thirty million, one hundred twenty thousand, twenty-one".