1220121220231 has 2 divisors, whose sum is σ = 1220121220232. Its totient is φ = 1220121220230.

The previous prime is 1220121220229. The next prime is 1220121220243. The reversal of 1220121220231 is 1320221210221.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1220121220231 - 2¹ = 1220121220229 is a prime.

It is a super-2 number, since 2×1220121220231² (a number of 25 digits) contains 22 as substring.

Together with 1220121220229, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 1220121220199 and 1220121220208.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1220121220291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610060610115 + 610060610116.

It is an arithmetic number, because the mean of its divisors is an integer number (610060610116).

Almost surely, 2^{1220121220231} is an apocalyptic number.

1220121220231 is a deficient number, since it is larger than the sum of its proper divisors (1).

1220121220231 is an equidigital number, since it uses as much as digits as its factorization.

1220121220231 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 192, while the sum is 19.

Adding to 1220121220231 its reverse (1320221210221), we get a palindrome (2540342430452).

The spelling of 1220121220231 in words is "one trillion, two hundred twenty billion, one hundred twenty-one million, two hundred twenty thousand, two hundred thirty-one".