1212220212021 has 96 divisors (see below), whose sum is σ = 2214067215360. Its totient is φ = 621916641792.

The previous prime is 1212220212011. The next prime is 1212220212031. The reversal of 1212220212021 is 1202120222121.

It is a happy number.

1212220212021 is a `hidden beast` number, since 1 + 212 + 220 + 212 + 0 + 21 = 666.

It is an interprime number because it is at equal distance from previous prime (1212220212011) and next prime (1212220212031).

It is not a de Polignac number, because 1212220212021 - 2¹⁰ = 1212220210997 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1212220211985 and 1212220212003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212220212011) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 125237460 + ... + 125247138.

It is an arithmetic number, because the mean of its divisors is an integer number (23063200160).

Almost surely, 2^{1212220212021} is an apocalyptic number.

It is an amenable number.

1212220212021 is a deficient number, since it is larger than the sum of its proper divisors (1001847003339).

1212220212021 is a wasteful number, since it uses less digits than its factorization.

1212220212021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13875 (or 13872 counting only the distinct ones).

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

Adding to 1212220212021 its reverse (1202120222121), we get a palindrome (2414340434142).

It can be divided in two parts, 1212220 and 212021, that added together give a palindrome (1424241).

The spelling of 1212220212021 in words is "one trillion, two hundred twelve billion, two hundred twenty million, two hundred twelve thousand, twenty-one".