1221023230021 has 12 divisors (see below), whose sum is σ = 1420695347232. Its totient is φ = 1046354529528.

The previous prime is 1221023229989. The next prime is 1221023230081. The reversal of 1221023230021 is 1200323201221.

It is not a de Polignac number, because 1221023230021 - 2⁵ = 1221023229989 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221023230081) 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 11 ways as a sum of consecutive naturals, for example, 2600235 + ... + 3033688.

It is an arithmetic number, because the mean of its divisors is an integer number (118391278936).

Almost surely, 2^{1221023230021} is an apocalyptic number.

It is an amenable number.

1221023230021 is a deficient number, since it is larger than the sum of its proper divisors (199672117211).

1221023230021 is an equidigital number, since it uses as much as digits as its factorization.

1221023230021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5638360 (or 5638353 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 1221023230021 its reverse (1200323201221), we get a palindrome (2421346431242).

The spelling of 1221023230021 in words is "one trillion, two hundred twenty-one billion, twenty-three million, two hundred thirty thousand, twenty-one".