222020020021 has 4 divisors (see below), whose sum is σ = 222203055052. Its totient is φ = 221836984992.

The previous prime is 222020020007. The next prime is 222020020067. The reversal of 222020020021 is 120020020222.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 120020020222 = 2 ⋅60010010111.

It can be written as a sum of positive squares in 2 ways, for example, as 12356767921 + 209663252100 = 111161^2 + 457890^2 .

It is a cyclic number.

It is not a de Polignac number, because 222020020021 - 2⁵ = 222020019989 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 222020019983 and 222020020010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (222020020421) 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, 91515696 + ... + 91518121.

It is an arithmetic number, because the mean of its divisors is an integer number (55550763763).

Almost surely, 2^222020020021 is an apocalyptic number.

It is an amenable number.

222020020021 is a deficient number, since it is larger than the sum of its proper divisors (183035031).

222020020021 is a wasteful number, since it uses less digits than its factorization.

222020020021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 183035030.

The product of its (nonzero) digits is 64, while the sum is 13.

Adding to 222020020021 its reverse (120020020222), we get a palindrome (342040040243).

The spelling of 222020020021 in words is "two hundred twenty-two billion, twenty million, twenty thousand, twenty-one".