220021012021 has 4 divisors (see below), whose sum is σ = 227607943500. Its totient is φ = 212434080544.

The previous prime is 220021012009. The next prime is 220021012033. The reversal of 220021012021 is 120210120022.

It is a happy number.

220021012021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (220021012009) and next prime (220021012033).

It can be written as a sum of positive squares in 2 ways, for example, as 127231323025 + 92789688996 = 356695^2 + 304614^2 .

It is a cyclic number.

It is not a de Polignac number, because 220021012021 - 2⁵ = 220021011989 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 220021011992 and 220021012010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220021012051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3793465696 + ... + 3793465753.

It is an arithmetic number, because the mean of its divisors is an integer number (56901985875).

Almost surely, 2^220021012021 is an apocalyptic number.

It is an amenable number.

220021012021 is a deficient number, since it is larger than the sum of its proper divisors (7586931479).

220021012021 is an equidigital number, since it uses as much as digits as its factorization.

220021012021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7586931478.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 220021012021 its reverse (120210120022), we get a palindrome (340231132043).

The spelling of 220021012021 in words is "two hundred twenty billion, twenty-one million, twelve thousand, twenty-one".