1231311304222 has 4 divisors (see below), whose sum is σ = 1846966956336. Its totient is φ = 615655652110.

The previous prime is 1231311304217. The next prime is 1231311304229. The reversal of 1231311304222 is 2224031131321.

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

It is a super-2 number, since 2×1231311304222² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231311304229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 307827826054 + ... + 307827826057.

It is an arithmetic number, because the mean of its divisors is an integer number (461741739084).

Almost surely, 2^{1231311304222} is an apocalyptic number.

1231311304222 is a deficient number, since it is larger than the sum of its proper divisors (615655652114).

1231311304222 is an equidigital number, since it uses as much as digits as its factorization.

1231311304222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 615655652113.

The product of its (nonzero) digits is 1728, while the sum is 25.

Adding to 1231311304222 its reverse (2224031131321), we get a palindrome (3455342435543).

The spelling of 1231311304222 in words is "one trillion, two hundred thirty-one billion, three hundred eleven million, three hundred four thousand, two hundred twenty-two".