1221321030031 has 4 divisors (see below), whose sum is σ = 1221336709672. Its totient is φ = 1221305350392.

The previous prime is 1221321029987. The next prime is 1221321030049. The reversal of 1221321030031 is 1300301231221.

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

It is a cyclic number.

It is not a de Polignac number, because 1221321030031 - 2²⁵ = 1221287475599 is a prime.

It is a super-2 number, since 2×1221321030031² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1221321029990 and 1221321030008.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221321031031) 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, 7722396 + ... + 7878961.

It is an arithmetic number, because the mean of its divisors is an integer number (305334177418).

Almost surely, 2^{1221321030031} is an apocalyptic number.

1221321030031 is a deficient number, since it is larger than the sum of its proper divisors (15679641).

1221321030031 is an equidigital number, since it uses as much as digits as its factorization.

1221321030031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15679640.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 1221321030031 its reverse (1300301231221), we get a palindrome (2521622261252).

The spelling of 1221321030031 in words is "one trillion, two hundred twenty-one billion, three hundred twenty-one million, thirty thousand, thirty-one".