222221002021 has 4 divisors (see below), whose sum is σ = 222376511500. Its totient is φ = 222065492544.

The previous prime is 222221002019. The next prime is 222221002039. The reversal of 222221002021 is 120200122222.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 120200122222 = 2 ⋅60100061111.

It can be written as a sum of positive squares in 2 ways, for example, as 27705602500 + 194515399521 = 166450^2 + 441039^2 .

It is a cyclic number.

It is not a de Polignac number, because 222221002021 - 2¹ = 222221002019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 222221001986 and 222221002004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (222221002121) 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, 77752596 + ... + 77755453.

It is an arithmetic number, because the mean of its divisors is an integer number (55594127875).

Almost surely, 2^222221002021 is an apocalyptic number.

It is an amenable number.

222221002021 is a deficient number, since it is larger than the sum of its proper divisors (155509479).

222221002021 is a wasteful number, since it uses less digits than its factorization.

222221002021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155509478.

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

Adding to 222221002021 its reverse (120200122222), we get a palindrome (342421124243).

The spelling of 222221002021 in words is "two hundred twenty-two billion, two hundred twenty-one million, two thousand, twenty-one".