222120202021 has 4 divisors (see below), whose sum is σ = 224319412044. Its totient is φ = 219920992000.

The previous prime is 222120202013. The next prime is 222120202027. The reversal of 222120202021 is 120202021222.

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

It can be written as a sum of positive squares in 2 ways, for example, as 196882113796 + 25238088225 = 443714^2 + 158865^2 .

It is a cyclic number.

It is not a de Polignac number, because 222120202021 - 2³ = 222120202013 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 222120201986 and 222120202004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (222120202027) 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, 1099604860 + ... + 1099605061.

It is an arithmetic number, because the mean of its divisors is an integer number (56079853011).

Almost surely, 2^222120202021 is an apocalyptic number.

It is an amenable number.

222120202021 is a deficient number, since it is larger than the sum of its proper divisors (2199210023).

222120202021 is a wasteful number, since it uses less digits than its factorization.

222120202021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2199210022.

The product of its (nonzero) digits is 128, while the sum is 16.

Adding to 222120202021 its reverse (120202021222), we get a palindrome (342322223243).

It can be divided in two parts, 222 and 120202021, that multiplied together give a palindrome (26684848662).

The spelling of 222120202021 in words is "two hundred twenty-two billion, one hundred twenty million, two hundred two thousand, twenty-one".