1212021122021 has 8 divisors (see below), whose sum is σ = 1265008702104. Its totient is φ = 1160149070080.

The previous prime is 1212021122017. The next prime is 1212021122047. The reversal of 1212021122021 is 1202211202121.

It can be written as a sum of positive squares in 4 ways, for example, as 344727508225 + 867293613796 = 587135^2 + 931286^2 .

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 1212021122021 - 2² = 1212021122017 is a prime.

It is a super-2 number, since 2×1212021122021² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212021122071) 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 7 ways as a sum of consecutive naturals, for example, 278879816 + ... + 278884161.

It is an arithmetic number, because the mean of its divisors is an integer number (158126087763).

Almost surely, 2^{1212021122021} is an apocalyptic number.

It is an amenable number.

1212021122021 is a deficient number, since it is larger than the sum of its proper divisors (52987580083).

1212021122021 is an equidigital number, since it uses as much as digits as its factorization.

1212021122021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 557764071.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 1212021122021 its reverse (1202211202121), we get a palindrome (2414232324142).

The spelling of 1212021122021 in words is "one trillion, two hundred twelve billion, twenty-one million, one hundred twenty-two thousand, twenty-one".