1212222021021 has 24 divisors (see below), whose sum is σ = 1910278435104. Its totient is φ = 734637550560.

The previous prime is 1212222021011. The next prime is 1212222021079. The reversal of 1212222021021 is 1201202222121.

It is a happy number.

1212222021021 is a `hidden beast` number, since 1 + 212 + 2 + 220 + 210 + 21 = 666.

It is not a de Polignac number, because 1212222021021 - 2²⁷ = 1212087803293 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1212222020985 and 1212222021003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212222021001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1411975 + ... + 2101931.

It is an arithmetic number, because the mean of its divisors is an integer number (79594934796).

Almost surely, 2^{1212222021021} is an apocalyptic number.

1212222021021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1212222021021 is a deficient number, since it is larger than the sum of its proper divisors (698056414083).

1212222021021 is a wasteful number, since it uses less digits than its factorization.

1212222021021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 707721 (or 707718 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 1212222021021 its reverse (1201202222121), we get a palindrome (2413424243142).

The spelling of 1212222021021 in words is "one trillion, two hundred twelve billion, two hundred twenty-two million, twenty-one thousand, twenty-one".