220201021 has 4 divisors (see below), whose sum is σ = 220237344. Its totient is φ = 220164700.

The previous prime is 220201019. The next prime is 220201043. The reversal of 220201021 is 120102022.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 120102022 = 2 ⋅60051011.

It is a cyclic number.

It is not a de Polignac number, because 220201021 - 2¹ = 220201019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 220200989 and 220201007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220201081) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6625 + ... + 22006.

It is an arithmetic number, because the mean of its divisors is an integer number (55059336).

Almost surely, 2^220201021 is an apocalyptic number.

It is an amenable number.

220201021 is a deficient number, since it is larger than the sum of its proper divisors (36323).

220201021 is an equidigital number, since it uses as much as digits as its factorization.

220201021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36322.

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

The square root of 220201021 is about 14839.1718434689. The cubic root of 220201021 is about 603.8648852413.

Adding to 220201021 its reverse (120102022), we get a palindrome (340303043).

The spelling of 220201021 in words is "two hundred twenty million, two hundred one thousand, twenty-one".