1211232121011 has 24 divisors (see below), whose sum is σ = 1908950434560. Its totient is φ = 733948441200.

The previous prime is 1211232121009. The next prime is 1211232121061. The reversal of 1211232121011 is 1101212321121.

It is a happy number.

1211232121011 is a `hidden beast` number, since 1 + 211 + 232 + 1 + 210 + 11 = 666.

It is not a de Polignac number, because 1211232121011 - 2¹ = 1211232121009 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1211232121061) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 540631 + ... + 1647648.

It is an arithmetic number, because the mean of its divisors is an integer number (79539601440).

Almost surely, 2^{1211232121011} is an apocalyptic number.

1211232121011 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1211232121011 is a deficient number, since it is larger than the sum of its proper divisors (697718313549).

1211232121011 is a wasteful number, since it uses less digits than its factorization.

1211232121011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2193887 (or 2193884 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 18.

Adding to 1211232121011 its reverse (1101212321121), we get a palindrome (2312444442132).

It can be divided in two parts, 12112 and 32121011, that added together give a palindrome (32133123).

The spelling of 1211232121011 in words is "one trillion, two hundred eleven billion, two hundred thirty-two million, one hundred twenty-one thousand, eleven".