1231232021111 has 16 divisors (see below), whose sum is σ = 1241754346560. Its totient is φ = 1220750507520.

The previous prime is 1231232021093. The next prime is 1231232021113. The reversal of 1231232021111 is 1111202321321.

It is a cyclic number.

It is not a de Polignac number, because 1231232021111 - 2¹⁰ = 1231232020087 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 (1231232021113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 160542785 + ... + 160550453.

It is an arithmetic number, because the mean of its divisors is an integer number (77609646660).

Almost surely, 2^{1231232021111} is an apocalyptic number.

1231232021111 is a deficient number, since it is larger than the sum of its proper divisors (10522325449).

1231232021111 is a wasteful number, since it uses less digits than its factorization.

1231232021111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10154.

The product of its (nonzero) digits is 144, while the sum is 20.

Adding to 1231232021111 its reverse (1111202321321), we get a palindrome (2342434342432).

The spelling of 1231232021111 in words is "one trillion, two hundred thirty-one billion, two hundred thirty-two million, twenty-one thousand, one hundred eleven".