1220202021 has 36 divisors (see below), whose sum is σ = 1766876832. Its totient is φ = 748914336.

The previous prime is 1220202001. The next prime is 1220202031. The reversal of 1220202021 is 1202020221.

It is not a de Polignac number, because 1220202021 - 2¹⁰ = 1220200997 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1220201988 and 1220202006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220202001) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 1482216 + ... + 1483038.

It is an arithmetic number, because the mean of its divisors is an integer number (49079912).

Almost surely, 2^1220202021 is an apocalyptic number.

It is an amenable number.

1220202021 is a deficient number, since it is larger than the sum of its proper divisors (546674811).

1220202021 is an equidigital number, since it uses as much as digits as its factorization.

1220202021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 938 (or 882 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 12.

The square root of 1220202021 is about 34931.3901956392. The cubic root of 1220202021 is about 1068.5887065234.

Adding to 1220202021 its reverse (1202020221), we get a palindrome (2422222242).

It can be divided in two parts, 1 and 220202021, that added together give a palindrome (220202022).

The spelling of 1220202021 in words is "one billion, two hundred twenty million, two hundred two thousand, twenty-one".