1211230432111 has 4 divisors (see below), whose sum is σ = 1384263350992. Its totient is φ = 1038197513232.

The previous prime is 1211230431973. The next prime is 1211230432129. The reversal of 1211230432111 is 1112340321121.

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 1211230432111 - 2¹¹ = 1211230430063 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 (1211230432141) 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, 86516459430 + ... + 86516459443.

It is an arithmetic number, because the mean of its divisors is an integer number (346065837748).

Almost surely, 2^{1211230432111} is an apocalyptic number.

1211230432111 is a deficient number, since it is larger than the sum of its proper divisors (173032918881).

1211230432111 is an equidigital number, since it uses as much as digits as its factorization.

1211230432111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 173032918880.

The product of its (nonzero) digits is 288, while the sum is 22.

Adding to 1211230432111 its reverse (1112340321121), we get a palindrome (2323570753232).

The spelling of 1211230432111 in words is "one trillion, two hundred eleven billion, two hundred thirty million, four hundred thirty-two thousand, one hundred eleven".