1220220021 has 8 divisors (see below), whose sum is σ = 1630634400. Its totient is φ = 811642832.

The previous prime is 1220220019. The next prime is 1220220031. The reversal of 1220220021 is 1200220221.

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 1220220021 - 2¹ = 1220220019 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1220219979 and 1220220006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220220031) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 457746 + ... + 460403.

It is an arithmetic number, because the mean of its divisors is an integer number (203829300).

Almost surely, 2^1220220021 is an apocalyptic number.

It is an amenable number.

1220220021 is a deficient number, since it is larger than the sum of its proper divisors (410414379).

1220220021 is an equidigital number, since it uses as much as digits as its factorization.

1220220021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 918595.

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

The square root of 1220220021 is about 34931.6478426083. The cubic root of 1220220021 is about 1068.5939609817.

Adding to 1220220021 its reverse (1200220221), we get a palindrome (2420440242).

It can be divided in two parts, 12202 and 20021, that added together give a palindrome (32223).

The spelling of 1220220021 in words is "one billion, two hundred twenty million, two hundred twenty thousand, twenty-one".