1211031212121 has 24 divisors (see below), whose sum is σ = 1752300973280. Its totient is φ = 805954665600.

The previous prime is 1211031212113. The next prime is 1211031212147. The reversal of 1211031212121 is 1212121301121.

It is a happy number.

1211031212121 is a `hidden beast` number, since 1 + 211 + 0 + 312 + 121 + 21 = 666.

It is not a de Polignac number, because 1211031212121 - 2³ = 1211031212113 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1211031212094 and 1211031212103.

It is not an unprimeable number, because it can be changed into a prime (1211031212221) 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, 23226801 + ... + 23278881.

Almost surely, 2^{1211031212121} is an apocalyptic number.

It is an amenable number.

1211031212121 is a deficient number, since it is larger than the sum of its proper divisors (541269761159).

1211031212121 is a wasteful number, since it uses less digits than its factorization.

1211031212121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56517 (or 56514 counting only the distinct ones).

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

Adding to 1211031212121 its reverse (1212121301121), we get a palindrome (2423152513242).

The spelling of 1211031212121 in words is "one trillion, two hundred eleven billion, thirty-one million, two hundred twelve thousand, one hundred twenty-one".