1211320013223 has 4 divisors (see below), whose sum is σ = 1615093350968. Its totient is φ = 807546675480.

The previous prime is 1211320013129. The next prime is 1211320013263. The reversal of 1211320013223 is 3223100231121.

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

It is not a de Polignac number, because 1211320013223 - 2¹² = 1211320009127 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1211320013223.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211320013263) 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, 201886668868 + ... + 201886668873.

It is an arithmetic number, because the mean of its divisors is an integer number (403773337742).

Almost surely, 2^{1211320013223} is an apocalyptic number.

1211320013223 is a deficient number, since it is larger than the sum of its proper divisors (403773337745).

1211320013223 is an equidigital number, since it uses as much as digits as its factorization.

1211320013223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 403773337744.

The product of its (nonzero) digits is 432, while the sum is 21.

Adding to 1211320013223 its reverse (3223100231121), we get a palindrome (4434420244344).

The spelling of 1211320013223 in words is "one trillion, two hundred eleven billion, three hundred twenty million, thirteen thousand, two hundred twenty-three".