220102021 has 8 divisors (see below), whose sum is σ = 222697944. Its totient is φ = 217512960.

The previous prime is 220102013. The next prime is 220102027. The reversal of 220102021 is 120201022.

It can be written as a sum of positive squares in 4 ways, for example, as 617796 + 219484225 = 786^2 + 14815^2 .

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 220102021 - 2³ = 220102013 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 220101989 and 220102007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220102027) 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, 91251 + ... + 93631.

It is an arithmetic number, because the mean of its divisors is an integer number (27837243).

Almost surely, 2^220102021 is an apocalyptic number.

It is an amenable number.

220102021 is a deficient number, since it is larger than the sum of its proper divisors (2595923).

220102021 is an equidigital number, since it uses as much as digits as its factorization.

220102021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3431.

The product of its (nonzero) digits is 16, while the sum is 10.

The square root of 220102021 is about 14835.8357027840. The cubic root of 220102021 is about 603.7743746330.

Adding to 220102021 its reverse (120201022), we get a palindrome (340303043).

Subtracting from 220102021 its reverse (120201022), we obtain a palindrome (99900999).

The spelling of 220102021 in words is "two hundred twenty million, one hundred two thousand, twenty-one".