1211012133021 has 16 divisors (see below), whose sum is σ = 1794162510720. Its totient is φ = 807309714240.

The previous prime is 1211012133017. The next prime is 1211012133047. The reversal of 1211012133021 is 1203312101121.

1211012133021 is a `hidden beast` number, since 1 + 211 + 0 + 121 + 330 + 2 + 1 = 666.

It is not a de Polignac number, because 1211012133021 - 2² = 1211012133017 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1211012132985 and 1211012133003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211012333021) 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, 170145 + ... + 1565558.

It is an arithmetic number, because the mean of its divisors is an integer number (112135156920).

Almost surely, 2^{1211012133021} is an apocalyptic number.

It is an amenable number.

1211012133021 is a deficient number, since it is larger than the sum of its proper divisors (583150377699).

1211012133021 is a wasteful number, since it uses less digits than its factorization.

1211012133021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1761553 (or 1761547 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 18.

Adding to 1211012133021 its reverse (1203312101121), we get a palindrome (2414324234142).

The spelling of 1211012133021 in words is "one trillion, two hundred eleven billion, twelve million, one hundred thirty-three thousand, twenty-one".