1211100212131 has 8 divisors (see below), whose sum is σ = 1212188799744. Its totient is φ = 1210011887040.

The previous prime is 1211100212111. The next prime is 1211100212237. The reversal of 1211100212131 is 1312120011121.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1211100212131 - 2¹⁹ = 1211099687843 is a prime.

It is a super-2 number, since 2×1211100212131² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1211100212111) 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 7 ways as a sum of consecutive naturals, for example, 9829101 + ... + 9951553.

It is an arithmetic number, because the mean of its divisors is an integer number (151523599968).

Almost surely, 2^{1211100212131} is an apocalyptic number.

1211100212131 is a deficient number, since it is larger than the sum of its proper divisors (1088587613).

1211100212131 is a wasteful number, since it uses less digits than its factorization.

1211100212131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131261.

The product of its (nonzero) digits is 24, while the sum is 16.

Adding to 1211100212131 its reverse (1312120011121), we get a palindrome (2523220223252).

The spelling of 1211100212131 in words is "one trillion, two hundred eleven billion, one hundred million, two hundred twelve thousand, one hundred thirty-one".