1211553405223 has 4 divisors (see below), whose sum is σ = 1384632463120. Its totient is φ = 1038474347328.

The previous prime is 1211553405193. The next prime is 1211553405229. The reversal of 1211553405223 is 3225043551121.

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

It is a cyclic number.

It is not a de Polignac number, because 1211553405223 - 2¹³ = 1211553397031 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211553405229) 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, 86539528938 + ... + 86539528951.

It is an arithmetic number, because the mean of its divisors is an integer number (346158115780).

Almost surely, 2^{1211553405223} is an apocalyptic number.

1211553405223 is a deficient number, since it is larger than the sum of its proper divisors (173079057897).

1211553405223 is an equidigital number, since it uses as much as digits as its factorization.

1211553405223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 173079057896.

The product of its (nonzero) digits is 36000, while the sum is 34.

Adding to 1211553405223 its reverse (3225043551121), we get a palindrome (4436596956344).

The spelling of 1211553405223 in words is "one trillion, two hundred eleven billion, five hundred fifty-three million, four hundred five thousand, two hundred twenty-three".