1211223220113 has 16 divisors (see below), whose sum is σ = 1619302164480. Its totient is φ = 805315092816.

The previous prime is 1211223220079. The next prime is 1211223220157. The reversal of 1211223220113 is 3110223221121.

It is not a de Polignac number, because 1211223220113 - 2⁹ = 1211223219601 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1211223220113.

It is not an unprimeable number, because it can be changed into a prime (1211223220213) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2353608 + ... + 2821686.

It is an arithmetic number, because the mean of its divisors is an integer number (101206385280).

Almost surely, 2^{1211223220113} is an apocalyptic number.

It is an amenable number.

1211223220113 is a deficient number, since it is larger than the sum of its proper divisors (408078944367).

1211223220113 is a wasteful number, since it uses less digits than its factorization.

1211223220113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 470396.

The product of its (nonzero) digits is 288, while the sum is 21.

Adding to 1211223220113 its reverse (3110223221121), we get a palindrome (4321446441234).

The spelling of 1211223220113 in words is "one trillion, two hundred eleven billion, two hundred twenty-three million, two hundred twenty thousand, one hundred thirteen".