1223220221031 has 4 divisors (see below), whose sum is σ = 1630960294712. Its totient is φ = 815480147352.

The previous prime is 1223220220949. The next prime is 1223220221051. The reversal of 1223220221031 is 1301220223221.

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

It is not a de Polignac number, because 1223220221031 - 2³⁰ = 1222146479207 is a prime.

It is a super-2 number, since 2×1223220221031² (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 = 1223220220989 and 1223220221007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1223220221051) 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, 203870036836 + ... + 203870036841.

It is an arithmetic number, because the mean of its divisors is an integer number (407740073678).

Almost surely, 2^{1223220221031} is an apocalyptic number.

1223220221031 is a deficient number, since it is larger than the sum of its proper divisors (407740073681).

1223220221031 is an equidigital number, since it uses as much as digits as its factorization.

1223220221031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 407740073680.

The product of its (nonzero) digits is 576, while the sum is 21.

Adding to 1223220221031 its reverse (1301220223221), we get a palindrome (2524440444252).

The spelling of 1223220221031 in words is "one trillion, two hundred twenty-three billion, two hundred twenty million, two hundred twenty-one thousand, thirty-one".