1211312021211 has 16 divisors (see below), whose sum is σ = 1795142094720. Its totient is φ = 807268752360.

The previous prime is 1211312021201. The next prime is 1211312021273. The reversal of 1211312021211 is 1121202131121.

It is a happy number.

1211312021211 is a `hidden beast` number, since 121 + 1 + 312 + 0 + 21 + 211 = 666.

It is not a de Polignac number, because 1211312021211 - 2¹⁰ = 1211312020187 is a prime.

It is a super-2 number, since 2×1211312021211² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1211312021201) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7490605 + ... + 7650606.

It is an arithmetic number, because the mean of its divisors is an integer number (112196380920).

Almost surely, 2^{1211312021211} is an apocalyptic number.

1211312021211 is a deficient number, since it is larger than the sum of its proper divisors (583830073509).

1211312021211 is a wasteful number, since it uses less digits than its factorization.

1211312021211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15144183 (or 15144177 counting only the distinct ones).

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

Adding to 1211312021211 its reverse (1121202131121), we get a palindrome (2332514152332).

The spelling of 1211312021211 in words is "one trillion, two hundred eleven billion, three hundred twelve million, twenty-one thousand, two hundred eleven".