1220021220221 has 8 divisors (see below), whose sum is σ = 1264398229920. Its totient is φ = 1175798031408.

The previous prime is 1220021220191. The next prime is 1220021220281. The reversal of 1220021220221 is 1220221200221.

It is a happy number.

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 1220021220221 - 2¹⁴ = 1220021203837 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1220021220221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220021220281) 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, 38439071 + ... + 38470796.

It is an arithmetic number, because the mean of its divisors is an integer number (158049778740).

Almost surely, 2^{1220021220221} is an apocalyptic number.

It is an amenable number.

1220021220221 is a deficient number, since it is larger than the sum of its proper divisors (44377009699).

1220021220221 is an equidigital number, since it uses as much as digits as its factorization.

1220021220221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76910443.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 1220021220221 its reverse (1220221200221), we get a palindrome (2440242420442).

The spelling of 1220021220221 in words is "one trillion, two hundred twenty billion, twenty-one million, two hundred twenty thousand, two hundred twenty-one".