1211223441340 has 24 divisors (see below), whose sum is σ = 2774802793392. Its totient is φ = 440444887680.

The previous prime is 1211223441331. The next prime is 1211223441343. The reversal of 1211223441340 is 431443221121.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 1211223441299 and 1211223441308.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211223441343) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2752780329 + ... + 2752780768.

It is an arithmetic number, because the mean of its divisors is an integer number (115616783058).

Almost surely, 2^{1211223441340} is an apocalyptic number.

1211223441340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1211223441340 is an abundant number, since it is smaller than the sum of its proper divisors (1563579352052).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1211223441340 is a wasteful number, since it uses less digits than its factorization.

1211223441340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5505561117 (or 5505561115 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 28.

Adding to 1211223441340 its reverse (431443221121), we get a palindrome (1642666662461).

The spelling of 1211223441340 in words is "one trillion, two hundred eleven billion, two hundred twenty-three million, four hundred forty-one thousand, three hundred forty".