1212020010221 has 4 divisors (see below), whose sum is σ = 1224020208444. Its totient is φ = 1200019812000.

The previous prime is 1212020010203. The next prime is 1212020010239. The reversal of 1212020010221 is 1220100202121.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (1212020010203) and next prime (1212020010239).

It can be written as a sum of positive squares in 2 ways, for example, as 1009532610025 + 202487400196 = 1004755^2 + 449986^2 .

It is a cyclic number.

It is not a de Polignac number, because 1212020010221 - 2¹⁴ = 1212019993837 is a prime.

It is a super-2 number, since 2×1212020010221² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1212020010196 and 1212020010205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212020010251) 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 3 ways as a sum of consecutive naturals, for example, 6000098960 + ... + 6000099161.

It is an arithmetic number, because the mean of its divisors is an integer number (306005052111).

Almost surely, 2^{1212020010221} is an apocalyptic number.

It is an amenable number.

1212020010221 is a deficient number, since it is larger than the sum of its proper divisors (12000198223).

1212020010221 is a wasteful number, since it uses less digits than its factorization.

1212020010221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12000198222.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 1212020010221 its reverse (1220100202121), we get a palindrome (2432120212342).

The spelling of 1212020010221 in words is "one trillion, two hundred twelve billion, twenty million, ten thousand, two hundred twenty-one".